rockchip: rk3368: migrate to use common spl board file

rk3368 has similar boot flow in SPL with other Rockchip SoCs,
migrate to use common spl board file.

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 05d207d..25214bc 100644
--- a/arch/arm/mach-rockchip/Kconfig
+++ b/arch/arm/mach-rockchip/Kconfig
@@ -125,6 +125,7 @@
 	select SUPPORT_TPL
 	select TPL_NEEDS_SEPARATE_TEXT_BASE if SPL
 	select TPL_NEEDS_SEPARATE_STACK if TPL
+	imply SPL_ROCKCHIP_COMMON_BOARD
 	imply SPL_SEPARATE_BSS
 	imply SPL_SERIAL_SUPPORT
 	imply TPL_SERIAL_SUPPORT