config: rk3399: enable dwmmc controller

Enable the rockchip dwmmc driver for rk3399 and its evb.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/include/configs/rk3399_common.h b/include/configs/rk3399_common.h
index 1ed4641..6875308 100644
--- a/include/configs/rk3399_common.h
+++ b/include/configs/rk3399_common.h
@@ -30,6 +30,7 @@
 /* MMC/SD IP block */
 #define CONFIG_MMC
 #define CONFIG_GENERIC_MMC
+#define CONFIG_DWMMC
 #define CONFIG_SDHCI
 #define CONFIG_BOUNCE_BUFFER
 #define CONFIG_ROCKCHIP_SDHCI_MAX_FREQ	200000000