rockchip: firefly-rk3399: enable ATF and dwmmc

enable the ATF option and SDCard in defconfig.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

configs/firefly-rk3399_defconfig

@@ -13,6 +13,8 @@ CONFIG_SPL_LOAD_FIT=y
 CONFIG_SPL_STACK_R=y
 CONFIG_SPL_STACK_R_MALLOC_SIMPLE_LEN=0x4000
 CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR=0x200
+CONFIG_SPL_ATF_SUPPORT=y
+CONFIG_SPL_ATF_TEXT_BASE=0x00010000
 CONFIG_CMD_BOOTZ=y
 # CONFIG_CMD_IMLS is not set
 CONFIG_CMD_GPT=y