rockchip: rk3288: Migrate to use common spl board file

rk3288 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 ef9d6e1..3497920 100644
--- a/arch/arm/mach-rockchip/Kconfig
+++ b/arch/arm/mach-rockchip/Kconfig
@@ -76,6 +76,7 @@
 	select SUPPORT_SPL
 	select SPL
 	select SUPPORT_TPL
+	imply SPL_ROCKCHIP_COMMON_BOARD
 	imply TPL_CLK
 	imply TPL_DM
 	imply TPL_DRIVERS_MISC_SUPPORT