ipq40xx: add kernel 6.6 as a testing kernel version

Add and enable kernel 6.6 as a testing kernel version.

Signed-off-by: Christian Marangi <[email protected]>

target/linux/ipq40xx/Makefile

@@ -9,6 +9,7 @@ CPU_SUBTYPE:=neon-vfpv4
 SUBTARGETS:=generic chromium mikrotik
 
 KERNEL_PATCHVER:=6.1
+KERNEL_TESTING_PATCHVER:=6.6
 
 KERNELNAME:=zImage Image dtbs