rockchip: config: rk3399: enable SPL config for evb-rk3399

Enable all the CONFIGs which need by SPL.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Added rockchip tag:
Drop CONFIG_ROCKCHIP_DWMMC for now due to build error:
Move changes to arch/arm/mach-rockchip/Kconfig to this patch:
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-rockchip/Kconfig b/arch/arm/mach-rockchip/Kconfig
index ba9fbbb..565908a 100644
--- a/arch/arm/mach-rockchip/Kconfig
+++ b/arch/arm/mach-rockchip/Kconfig
@@ -41,6 +41,9 @@
 config ROCKCHIP_RK3399
 	bool "Support Rockchip RK3399"
 	select ARM64
+	select SUPPORT_SPL
+	select SPL
+	select SPL_SEPARATE_BSS
 	help
 	  The Rockchip RK3399 is a ARM-based SoC with a dual-core Cortex-A72
 	  and quad-core Cortex-A53.