ath79: enable 6.6 testing kernel

The ath79 target now supports the vanilla 6.6 kernel. Enjoy it!

Signed-off-by: Shiji Yang <[email protected]>

target/linux/ath79/Makefile

@@ -9,6 +9,7 @@ SUBTARGETS:=generic mikrotik nand tiny
 FEATURES:=ramdisk squashfs usbgadget
 
 KERNEL_PATCHVER:=6.1
+KERNEL_TESTING_PATCHVER:=6.6
 
 include $(INCLUDE_DIR)/target.mk