mips: ath79: add support for AR933x SOCs

This patch enable work for ar933x SOC.

Signed-off-by: Wills Wang <wills.wang@live.com>
diff --git a/arch/mips/mach-ath79/Makefile b/arch/mips/mach-ath79/Makefile
index 6203cf0..9b9447e 100644
--- a/arch/mips/mach-ath79/Makefile
+++ b/arch/mips/mach-ath79/Makefile
@@ -5,3 +5,5 @@
 obj-y += reset.o
 obj-y += cpu.o
 obj-y += dram.o
+
+obj-$(CONFIG_SOC_AR933X)	+= ar933x/
\ No newline at end of file