mvebu: Use kernel 4.14 by default

I am not aware of any regressions in kernel 4.14 compared to kernel 4.9.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/mvebu/Makefile

@@ -14,7 +14,7 @@ CPU_TYPE:=cortex-a9
 CPU_SUBTYPE:=vfpv3
 MAINTAINER:=Imre Kaloz <kaloz@openwrt.org>
 
-KERNEL_PATCHVER:=4.9
+KERNEL_PATCHVER:=4.14
 
 include $(INCLUDE_DIR)/target.mk