ar71xx: switch to linux 4.1

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46432 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/ar71xx/Makefile

@@ -13,7 +13,7 @@ FEATURES:=mips16
 CPU_TYPE=34kc
 SUBTARGETS:=generic nand mikrotik
 
-KERNEL_PATCHVER:=3.18
+KERNEL_PATCHVER:=4.1
 
 include $(INCLUDE_DIR)/target.mk