hi3516cv100_neo: Linux 7.0 firmware target (V1 / ARM926EJ-S)

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Summary

Adds the firmware-side pieces to assemble a `hi3516cv100_neo` image against the Linux 7.0 base in `openipc/linux:upstream-patches`. Completes the three-repo chain:

Repo	PR	State
OpenIPC/linux	#46	✅ MERGED (cv100 DT + mach-hibvt)
OpenIPC/openhisilicon	#187	✅ MERGED (v1_shim + ksymtab re-exports + source patches)
OpenIPC/firmware	this PR	—

Changes

• `br-ext-chip-hisilicon/configs/hi3516cv100_neo_defconfig` — buildroot config. Reuses cv100_lite's V1 musleabi toolchain (3.0 headers, which is fine since Linux preserves syscall ABI backward compat). Points kernel at `upstream-patches.tar.gz`, selects hisilicon-opensdk + majestic + the standard OpenIPC userspace package set. `VARIANT="neo"` gates the hisilicon-opensdk install rule's `v1_shim` ship.

• `br-ext-chip-hisilicon/board/hi3516cv100/hi3516cv100.neo.config` — kernel config seed (~215 lines). `ARCH_HI3516CV100=y` selects `ARM_VIC` + `ARM_TIMER_SP804` + `COMMON_CLK_HI3516CV200` per openipc/linux PR Change XMC flash mode to READ_DUAL #46. Built as zImage with appended DTB; CMA enabled for the openhisilicon MMZ allocator.

• `br-ext-chip-hisilicon/board/hi3516cv100/neo-post-image.sh` — wraps zImage + `hi3516cv100-demb.dtb` into a U-Boot uImage at load/entry `0x80008000` (same as cv200_neo / cv300_neo).

• `general/package/hisilicon-opensdk/hisilicon-opensdk.mk` — bump pin `7fa06b2 → 488a76f` (cv100 7.0 support, openhisilicon PR fix kernel and rootfs filesize checking, keep libstdc++ for fpv profile #187 merge). Transitively picks up:

  • `14fc1950` openipc_event_trigger sample (Something to review and discuss. #184)
  • `6bc0face` cv200 isp.c tasklet-defer for add wifibroadcast, rtl8812au, ath9271 drivers and more small changes #183 — the regression fix that motivated Revert "hisilicon-opensdk: bump 7fa06b2 → 28a30ca (#2126)" #2128 reverting the earlier opensdk bump
  • `488a76f1` cv100 7.0 port (fix kernel and rootfs filesize checking, keep libstdc++ for fpv profile #187)

  Also adds the v1_shim install rule for cv100/neo variant.

• `.github/workflows/build.yml` — add hi3516cv100_neo to the CI matrix.

Verification

Built locally via this defconfig + manual `make BOARD=hi3516cv100_neo br-hisilicon-opensdk br-linux` against this branch. uImage = 1.88MB (zImage 1.78MB + DTB 4.4KB wrapped by neo-post-image.sh).

Booted under `qemu-system-arm -M hi3516cv100 -m 64M`:

```
hisi-femac 10090000.ethernet eth0: Link is Up - 100Mbps/Full
cv100 V1 OSAL shim: ready (do_gettimeofday, register_sysctl_table, ...)
openipc-hi3516cv100 login:
eth0 inet addr:10.0.2.15
64 bytes from 10.0.2.2: seq=0 ttl=255 time=135.170 ms
64 bytes from 10.0.2.2: seq=1 ttl=255 time=16.912 ms
```

Boots to login, eth0 up via SLIRP, ping gateway succeeds steady-state. No Oops/panic/BUG. `open_v1_shim.ko` inserts cleanly at boot.

cv100_lite (kernel 3.0.8 production) byte-equivalence vs nightly confirmed via QEMU diff:

• identical 33-module lsmod
• dmesg diff is 2 benign lines (random MAC + 1 KiB ramdisk size from `EXPORT_SYMBOL` additions in init wrappers — see openhisilicon PR fix kernel and rootfs filesize checking, keep libstdc++ for fpv profile #187 for details)

Test plan

• cv100_neo opensdk + kernel compile clean (toolchain 3.0 headers, 7.0 kernel)
• cv100_neo QEMU boot — login prompt + eth0 UP + ping gateway
• cv100_lite (kernel 3.0.8) no-regression — lsmod identical, dmesg = nightly + 2 benign lines
• Real-hardware test on a cv100 board — deferred

Out of scope

`mmz.ko` / `hi3518_base.ko` fail `insmod` on cv100_neo at runtime with `.gnu.linkonce.this_module section size must match the kernel's built struct module size` — pre-compiled cv100 blobs embed a `struct module` sized for kernel 3.0.8; modern 7.0 expects a different layout. Same drift cv200/av100 hit; fix lives elsewhere (vermagic shim or blob recompile). Doesn't affect cv100_lite (production target) and doesn't block the cv100_neo boot/ethernet DoDs above.

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