ipq40xx: add 6.1 as testing kernel

Allow selecting 6.1 as the testing kernel.

Signed-off-by: Robert Marko <[email protected]>

target/linux/ipq40xx/Makefile

@@ -9,6 +9,7 @@ CPU_SUBTYPE:=neon-vfpv4
 SUBTARGETS:=generic chromium mikrotik
 
 KERNEL_PATCHVER:=5.15
+KERNEL_TESTING_PATCHVER:=6.1
 
 KERNELNAME:=zImage Image dtbs