malta: switch to kernel 5.4 by default

Signed-off-by: Yousong Zhou <[email protected]>

target/linux/malta/Makefile

@@ -13,7 +13,7 @@ SUBTARGETS:=le be le64 be64
 INITRAMFS_EXTRA_FILES:=
 FEATURES:=cpiogz ext4 ramdisk squashfs targz
 
-KERNEL_PATCHVER:=4.19
+KERNEL_PATCHVER:=5.4
 
 include $(INCLUDE_DIR)/target.mk