rk3288: add arch_cpu_init for rk3288

We do some SoC level one time setting initialization in
arch_cpu_init.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-rockchip/rk3288/Makefile b/arch/arm/mach-rockchip/rk3288/Makefile
index 5ec3f0d..b5b28ef 100644
--- a/arch/arm/mach-rockchip/rk3288/Makefile
+++ b/arch/arm/mach-rockchip/rk3288/Makefile
@@ -5,5 +5,6 @@
 #
 
 obj-y += clk_rk3288.o
+obj-y += rk3288.o
 obj-y += sdram_rk3288.o
 obj-y += syscon_rk3288.o