rockchip: rk3328: add clock driver

Add rk3328 clock driver and cru structure definition.

Signed-off-by: William Zhang <william.zhang@rock-chips.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/mach-rockchip/rk3328/Makefile b/arch/arm/mach-rockchip/rk3328/Makefile
index 8ecf8ee..bbab036 100644
--- a/arch/arm/mach-rockchip/rk3328/Makefile
+++ b/arch/arm/mach-rockchip/rk3328/Makefile
@@ -4,5 +4,6 @@
 # SPDX-License-Identifier:     GPL-2.0+
 #
 
+obj-y += clk_rk3328.o
 obj-y += rk3328.o
 obj-y += syscon_rk3328.o