ar71xx: switch to 24kc

GCC treats 24kc and 34kc exactly the same and will generate identical
code, so there is no need to tune to 34kc instead of 24kc.

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>

target/linux/ar71xx/Makefile

@@ -10,7 +10,7 @@ ARCH:=mips
 BOARD:=ar71xx
 BOARDNAME:=Atheros AR7xxx/AR9xxx
 FEATURES:=mips16
-CPU_TYPE=34kc
+CPU_TYPE=24kc
 SUBTARGETS:=generic nand mikrotik
 
 KERNEL_PATCHVER:=4.4