ath79: mikrotik: add 5.15 support for mikrotik subtarget

Tested on RB922

Signed-off-by: Koen Vandeputte <[email protected]>

target/linux/ath79/mikrotik/target.mk

@@ -5,6 +5,8 @@ IMAGES_DIR := ../../..
 
 DEFAULT_PACKAGES += wpad-basic-wolfssl
 
+KERNEL_TESTING_PATCHVER:=5.15
+
 define Target/Description
 	Build firmware images for MikroTik devices based on Qualcomm Atheros
 	MIPS SoCs (AR71xx, AR72xx, AR91xx, AR93xx, QCA95xx).