ramips: mt76x8: switch to kernel 5.4

4.14 doesn't work anymore due to gpio dt binding changes. Switch mt76x8
to 5.4 directly.

Signed-off-by: Chuanhong Guo <[email protected]>

target/linux/ramips/mt76x8/target.mk

@@ -8,6 +8,7 @@ FEATURES+=usb ramdisk
 CPU_TYPE:=24kc
 
 DEFAULT_PACKAGES += kmod-mt7603 wpad-basic swconfig
+KERNEL_PATCHVER:=5.4
 
 define Target/Description
 	Build firmware images for Ralink MT76x8 based boards.