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/ar933x/Makefile b/arch/mips/mach-ath79/ar933x/Makefile
new file mode 100644
index 0000000..fd74f0c
--- /dev/null
+++ b/arch/mips/mach-ath79/ar933x/Makefile
@@ -0,0 +1,7 @@
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-y += clk.o
+obj-y += ddr.o
+obj-y += lowlevel_init.o