ipq40xx: switch to kernel 5.10

There have been enough tests and new developments require the new
kernel, so let's update it.

There is a bunch of devices that do not build anymore due to
kernel size limitations. These are disabled in a subsequent commit.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/ipq40xx/Makefile

@@ -8,7 +8,7 @@ CPU_TYPE:=cortex-a7
 CPU_SUBTYPE:=neon-vfpv4
 SUBTARGETS:=generic mikrotik
 
-KERNEL_PATCHVER:=5.4
+KERNEL_PATCHVER:=5.10
 KERNEL_TESTING_PATCHVER:=5.10
 
 KERNELNAME:=zImage Image dtbs