layerscape: add 6.1 kernel as testing

It allow to test 6.1 kernel in Layerscape.

Signed-off-by: Pawel Dembicki <[email protected]>

target/linux/layerscape/Makefile

@@ -8,6 +8,7 @@ BOARD:=layerscape
 BOARDNAME:=NXP Layerscape
 
 KERNEL_PATCHVER:=5.15
+KERNEL_TESTING_PATCHVER:=6.1
 
 FEATURES:=squashfs nand usb pcie gpio fpu ubifs ext4 rootfs-part boot-part
 SUBTARGETS:=armv8_64b armv7