rockchip: rk322x: 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 ea8908c..a62ce44 100644
--- a/arch/arm/mach-rockchip/Kconfig
+++ b/arch/arm/mach-rockchip/Kconfig
@@ -60,6 +60,7 @@
 	select TPL_NEEDS_SEPARATE_TEXT_BASE if SPL
 	select TPL_NEEDS_SEPARATE_STACK if TPL
 	select SPL_DRIVERS_MISC_SUPPORT
+	imply ROCKCHIP_COMMON_BOARD
 	imply SPL_SERIAL_SUPPORT
 	imply SPL_ROCKCHIP_COMMON_BOARD
 	imply TPL_SERIAL_SUPPORT