rockchip: rk3036: Migrate to use common board file

Use common board file for board_init() and board_late_init(),
for Rockchip SoCs have very similar process.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/mach-rockchip/Kconfig b/arch/arm/mach-rockchip/Kconfig
index 4d983f8..74e37ee 100644
--- a/arch/arm/mach-rockchip/Kconfig
+++ b/arch/arm/mach-rockchip/Kconfig
@@ -7,6 +7,7 @@
 	select SPL
 	imply USB_FUNCTION_ROCKUSB
 	imply CMD_ROCKUSB
+	imply ROCKCHIP_COMMON_BOARD
 	help
 	  The Rockchip RK3036 is a ARM-based SoC with a dual-core Cortex-A7
 	  including NEON and GPU, Mali-400 graphics, several DDR3 options