rockchip: rk3128: add clock driver

Add rk3128 clock driver and cru structure definition.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/arch/arm/mach-rockchip/rk3128/Makefile b/arch/arm/mach-rockchip/rk3128/Makefile
index 0f63d92..50e1117 100644
--- a/arch/arm/mach-rockchip/rk3128/Makefile
+++ b/arch/arm/mach-rockchip/rk3128/Makefile
@@ -6,3 +6,4 @@
 
 obj-y += rk3128.o
 obj-y += syscon_rk3128.o
+obj-y += clk_rk3128.o