sunxi: switch to Kernel 5.10

Compile tested and run tested on Pine64+.

Acked-by: Daniel Golle <[email protected]>
Acked-by: Hauke Mehrtens <[email protected]>
Signed-off-by: Paul Spooren <[email protected]>

target/linux/sunxi/Makefile

@@ -10,8 +10,8 @@ BOARDNAME:=Allwinner A1x/A20/A3x/H3/H5/R40
 FEATURES:=fpu usb ext4 display rtc squashfs
 SUBTARGETS:=cortexa8 cortexa7 cortexa53
 
-KERNEL_PATCHVER:=5.4
-KERNEL_TESTING_PATCHVER:=5.10
+KERNEL_PATCHVER:=5.10
+
 KERNELNAME:=zImage dtbs
 
 # A10: Cortex-A8