apm821xx: add support for kernel 5.15 for testing

This patch copies over refreshed config and patches from 5.10
with the following changes:

 - dropped superfluous tc654/tc655 variant detection patch
   (tc654 support will become available upstream starting with
   5.17-rc7+).

 - dropped xhci msi(x) workaround... as the broken MSI(X)
   is now gone.

 - dropped dwc2 workaround since the driver was fixed and it
   works without it.

Please note: Netgear WNDAP660 & WNDAP620 users:

Due to the kernel's size increase, uboot will likely break
because it is overwrite the kernel during decompression.

To fix this (and debrick affected devices, no reflash
necessary), attach the RJ45-Serial-Console cable and
enter the following in the uboot prompt during bootup:

 setenv kernel_addr_r 1100000
 saveenv
 run bootcmd

to restore the old/previous behavior:

 setenv kernel_addr_r 600000
 saveenv
 run bootcmd

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

target/linux/apm821xx/Makefile

@@ -10,6 +10,7 @@ FEATURES:=fpu dt gpio ramdisk squashfs usb
 SUBTARGETS:=nand sata
 
 KERNEL_PATCHVER:=5.10
+KERNEL_TESTING_PATCHVER:=5.15
 
 define Target/Description
 	Build images for AppliedMicro APM821xx based boards.

target/linux/apm821xx/config-5.15

@@ -0,0 +1,245 @@
+# CONFIG_40x is not set
+CONFIG_44x=y
+CONFIG_4xx=y
+CONFIG_4xx_SOC=y
+# CONFIG_ADVANCED_OPTIONS is not set
+CONFIG_APM821xx=y
+# CONFIG_APOLLO3G is not set
+# CONFIG_ARCHES is not set
+CONFIG_ARCH_32BIT_OFF_T=y
+CONFIG_ARCH_DMA_ADDR_T_64BIT=y
+CONFIG_ARCH_HIBERNATION_POSSIBLE=y
+CONFIG_ARCH_KEEP_MEMBLOCK=y
+CONFIG_ARCH_MAY_HAVE_PC_FDC=y
+CONFIG_ARCH_MIGHT_HAVE_PC_PARPORT=y
+CONFIG_ARCH_MIGHT_HAVE_PC_SERIO=y
+CONFIG_ARCH_MMAP_RND_BITS=11
+CONFIG_ARCH_MMAP_RND_BITS_MAX=17
+CONFIG_ARCH_MMAP_RND_BITS_MIN=11
+CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MAX=17
+CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MIN=11
+CONFIG_ARCH_STACKWALK=y
+CONFIG_ARCH_SUSPEND_POSSIBLE=y
+CONFIG_ARCH_WEAK_RELEASE_ACQUIRE=y
+CONFIG_AUDIT_ARCH=y
+# CONFIG_BAMBOO is not set
+# CONFIG_BLK_DEV_INITRD is not set
+CONFIG_BLK_MQ_PCI=y
+CONFIG_BLUESTONE=y
+CONFIG_BOOKE=y
+CONFIG_BOOKE_WDT=y
+# CONFIG_CANYONLANDS is not set
+CONFIG_CLONE_BACKWARDS=y
+CONFIG_CMDLINE="rootfstype=squashfs noinitrd"
+CONFIG_CMDLINE_FROM_BOOTLOADER=y
+CONFIG_COMMON_CLK=y
+CONFIG_COMPAT_32BIT_TIME=y
+CONFIG_CPU_BIG_ENDIAN=y
+CONFIG_CRC16=y
+# CONFIG_CRC32_SARWATE is not set
+CONFIG_CRC32_SLICEBY8=y
+CONFIG_CRYPTO_DEFLATE=y
+CONFIG_CRYPTO_DEV_PPC4XX=y
+CONFIG_CRYPTO_HW=y
+CONFIG_CRYPTO_JITTERENTROPY=y
+CONFIG_CRYPTO_LIB_POLY1305_RSIZE=1
+CONFIG_CRYPTO_LZO=y
+# CONFIG_CRYPTO_MD5_PPC is not set
+CONFIG_CRYPTO_RNG=y
+CONFIG_CRYPTO_RNG2=y
+# CONFIG_CRYPTO_SHA1_PPC is not set
+CONFIG_DATA_SHIFT=12
+CONFIG_DMADEVICES=y
+CONFIG_DMA_DIRECT_REMAP=y
+CONFIG_DMA_ENGINE=y
+CONFIG_DMA_OF=y
+CONFIG_DMA_REMAP=y
+CONFIG_DTC=y
+CONFIG_DW_DMAC=y
+CONFIG_DW_DMAC_CORE=y
+CONFIG_EARLY_PRINTK=y
+# CONFIG_EBONY is not set
+CONFIG_EDAC_ATOMIC_SCRUB=y
+CONFIG_EDAC_SUPPORT=y
+# CONFIG_EIGER is not set
+CONFIG_EXTRA_TARGETS="uImage"
+CONFIG_FIXED_PHY=y
+CONFIG_FORCE_PCI=y
+# CONFIG_FSL_LBC is not set
+CONFIG_FWNODE_MDIO=y
+CONFIG_FW_LOADER_PAGED_BUF=y
+CONFIG_GENERIC_ALLOCATOR=y
+CONFIG_GENERIC_ATOMIC64=y
+CONFIG_GENERIC_BUG=y
+CONFIG_GENERIC_BUG_RELATIVE_POINTERS=y
+CONFIG_GENERIC_CLOCKEVENTS=y
+CONFIG_GENERIC_CMOS_UPDATE=y
+CONFIG_GENERIC_CPU=y
+CONFIG_GENERIC_CPU_AUTOPROBE=y
+CONFIG_GENERIC_EARLY_IOREMAP=y
+CONFIG_GENERIC_GETTIMEOFDAY=y
+CONFIG_GENERIC_IRQ_SHOW=y
+CONFIG_GENERIC_IRQ_SHOW_LEVEL=y
+CONFIG_GENERIC_ISA_DMA=y
+CONFIG_GENERIC_MSI_IRQ=y
+CONFIG_GENERIC_MSI_IRQ_DOMAIN=y
+CONFIG_GENERIC_PCI_IOMAP=y
+CONFIG_GENERIC_SMP_IDLE_THREAD=y
+CONFIG_GENERIC_STRNCPY_FROM_USER=y
+CONFIG_GENERIC_STRNLEN_USER=y
+CONFIG_GENERIC_TIME_VSYSCALL=y
+# CONFIG_GEN_RTC is not set
+# CONFIG_GLACIER is not set
+CONFIG_GPIOLIB=y
+CONFIG_GPIO_CDEV=y
+CONFIG_GPIO_GENERIC=y
+CONFIG_GPIO_GENERIC_PLATFORM=y
+CONFIG_HAS_DMA=y
+CONFIG_HAS_IOMEM=y
+CONFIG_HAS_IOPORT_MAP=y
+CONFIG_HW_RANDOM=y
+CONFIG_HW_RANDOM_PPC4XX=y
+CONFIG_I2C=y
+CONFIG_I2C_BOARDINFO=y
+CONFIG_I2C_CHARDEV=y
+CONFIG_I2C_IBM_IIC=y
+CONFIG_IBM_EMAC=y
+CONFIG_IBM_EMAC_EMAC4=y
+CONFIG_IBM_EMAC_POLL_WEIGHT=32
+CONFIG_IBM_EMAC_RGMII=y
+CONFIG_IBM_EMAC_RXB=128
+CONFIG_IBM_EMAC_RX_COPY_THRESHOLD=256
+CONFIG_IBM_EMAC_TAH=y
+CONFIG_IBM_EMAC_TXB=128
+# CONFIG_ICON is not set
+CONFIG_ILLEGAL_POINTER_VALUE=0
+CONFIG_IRQCHIP=y
+CONFIG_IRQ_DOMAIN=y
+CONFIG_IRQ_DOMAIN_HIERARCHY=y
+CONFIG_IRQ_FORCED_THREADING=y
+CONFIG_IRQ_WORK=y
+CONFIG_ISA_DMA_API=y
+# CONFIG_JFFS2_FS is not set
+# CONFIG_KATMAI is not set
+CONFIG_KERNEL_START=0xc0000000
+CONFIG_LEDS_TRIGGER_MTD=y
+CONFIG_LEDS_TRIGGER_PATTERN=y
+CONFIG_LIBFDT=y
+CONFIG_LOCK_DEBUGGING_SUPPORT=y
+CONFIG_LOWMEM_SIZE=0x30000000
+CONFIG_LZO_COMPRESS=y
+CONFIG_LZO_DECOMPRESS=y
+# CONFIG_MATH_EMULATION is not set
+CONFIG_MDIO_BUS=y
+CONFIG_MDIO_DEVICE=y
+CONFIG_MDIO_DEVRES=y
+CONFIG_MEMFD_CREATE=y
+CONFIG_MIGRATION=y
+CONFIG_MMU_GATHER_PAGE_SIZE=y
+CONFIG_MODULES_USE_ELF_RELA=y
+CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS=y
+CONFIG_MTD_CFI_ADV_OPTIONS=y
+# CONFIG_MTD_CFI_GEOMETRY is not set
+# CONFIG_MTD_SPLIT_SQUASHFS_ROOT is not set
+CONFIG_NEED_DMA_MAP_STATE=y
+CONFIG_NEED_PER_CPU_KM=y
+CONFIG_NEED_SG_DMA_LENGTH=y
+CONFIG_NET_SELFTESTS=y
+CONFIG_NOT_COHERENT_CACHE=y
+CONFIG_NO_HZ=y
+CONFIG_NO_HZ_COMMON=y
+CONFIG_NO_HZ_IDLE=y
+CONFIG_NR_CPUS=1
+CONFIG_NR_IRQS=512
+CONFIG_NVMEM=y
+CONFIG_NVMEM_SYSFS=y
+CONFIG_OF=y
+CONFIG_OF_ADDRESS=y
+CONFIG_OF_EARLY_FLATTREE=y
+CONFIG_OF_FLATTREE=y
+CONFIG_OF_GPIO=y
+CONFIG_OF_IRQ=y
+CONFIG_OF_KOBJ=y
+CONFIG_OF_MDIO=y
+CONFIG_OLD_SIGACTION=y
+CONFIG_OLD_SIGSUSPEND=y
+CONFIG_PACKING=y
+CONFIG_PAGE_OFFSET=0xc0000000
+CONFIG_PCI=y
+CONFIG_PCIEAER=y
+CONFIG_PCIEPORTBUS=y
+CONFIG_PCI_DISABLE_COMMON_QUIRKS=y
+CONFIG_PCI_DOMAINS=y
+CONFIG_PCI_MSI=y
+CONFIG_PCI_MSI_ARCH_FALLBACKS=y
+CONFIG_PCI_MSI_IRQ_DOMAIN=y
+CONFIG_PGTABLE_LEVELS=2
+CONFIG_PHYLIB=y
+CONFIG_PHYSICAL_START=0x00000000
+CONFIG_PHYS_64BIT=y
+CONFIG_PHYS_ADDR_T_64BIT=y
+# CONFIG_PMU_SYSFS is not set
+CONFIG_PPC=y
+CONFIG_PPC32=y
+CONFIG_PPC44x_SIMPLE=y
+CONFIG_PPC4xx_GPIO=y
+CONFIG_PPC4xx_MSI=y
+CONFIG_PPC4xx_PCI_EXPRESS=y
+# CONFIG_PPC64 is not set
+# CONFIG_PPC_47x is not set
+# CONFIG_PPC_85xx is not set
+# CONFIG_PPC_8xx is not set
+CONFIG_PPC_ADV_DEBUG_DACS=2
+CONFIG_PPC_ADV_DEBUG_DAC_RANGE=y
+CONFIG_PPC_ADV_DEBUG_DVCS=2
+CONFIG_PPC_ADV_DEBUG_IACS=4
+CONFIG_PPC_ADV_DEBUG_REGS=y
+# CONFIG_PPC_BOOK3S_32 is not set
+CONFIG_PPC_DCR=y
+CONFIG_PPC_DCR_NATIVE=y
+# CONFIG_PPC_EARLY_DEBUG is not set
+CONFIG_PPC_FPU=y
+CONFIG_PPC_FPU_REGS=y
+CONFIG_PPC_HAVE_KUEP=y
+CONFIG_PPC_INDIRECT_PCI=y
+CONFIG_PPC_KUEP=y
+CONFIG_PPC_MMU_NOHASH=y
+CONFIG_PPC_MSI_BITMAP=y
+CONFIG_PPC_PAGE_SHIFT=12
+CONFIG_PPC_UDBG_16550=y
+CONFIG_PPC_WERROR=y
+CONFIG_PTE_64BIT=y
+CONFIG_PTP_1588_CLOCK_OPTIONAL=y
+# CONFIG_RAINIER is not set
+CONFIG_RAS=y
+CONFIG_RATIONAL=y
+CONFIG_REGULATOR=y
+CONFIG_RSEQ=y
+# CONFIG_SAM440EP is not set
+# CONFIG_SCOM_DEBUGFS is not set
+# CONFIG_SEQUOIA is not set
+CONFIG_SERIAL_8250_FSL=y
+CONFIG_SERIAL_MCTRL_GPIO=y
+CONFIG_SERIAL_OF_PLATFORM=y
+CONFIG_SGL_ALLOC=y
+CONFIG_SPARSE_IRQ=y
+CONFIG_SRCU=y
+CONFIG_SWPHY=y
+CONFIG_SYSCTL_EXCEPTION_TRACE=y
+# CONFIG_TAISHAN is not set
+CONFIG_TASK_SIZE=0xc0000000
+CONFIG_THREAD_INFO_IN_TASK=y
+CONFIG_THREAD_SHIFT=13
+CONFIG_TICK_CPU_ACCOUNTING=y
+CONFIG_TINY_SRCU=y
+CONFIG_USB_SUPPORT=y
+CONFIG_VDSO32=y
+# CONFIG_VIRTIO_MENU is not set
+# CONFIG_VIRT_CPU_ACCOUNTING_NATIVE is not set
+# CONFIG_WARP is not set
+CONFIG_WATCHDOG_CORE=y
+CONFIG_XZ_DEC_BCJ=y
+CONFIG_XZ_DEC_POWERPC=y
+# CONFIG_YOSEMITE is not set
+CONFIG_ZLIB_DEFLATE=y
+CONFIG_ZLIB_INFLATE=y