ar71xx: set mips16 support, tune cflags for 34kc (works well on MIPS 24K as well, but helps a lot for 34K and 74K)

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

SVN-Revision: 36600

target/linux/ar71xx/Makefile

@@ -9,8 +9,8 @@ include $(TOPDIR)/rules.mk
 ARCH:=mips
 BOARD:=ar71xx
 BOARDNAME:=Atheros AR7xxx/AR9xxx
-FEATURES:=squashfs jffs2 targz
-CFLAGS:=-Os -pipe -mips32r2 -mtune=mips32r2 -fno-caller-saves -mno-branch-likely
+FEATURES:=squashfs jffs2 targz mips16
+CFLAGS:=-Os -pipe -mips32r2 -mtune=34kc -fno-caller-saves -mno-branch-likely
 SUBTARGETS:=generic nand
 
 LINUX_VERSION:=3.8.12