mmc: hi6220_dw_mmc: Add hi6220 glue code for dw_mmc controller.

This patch adds the glue code for hi6220 SoC which has 2x synopsis
dw_mmc controllers. This will be used by the hikey board support
in subsequent patches.

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
index 286df2f..cae207c 100644
--- a/drivers/mmc/Makefile
+++ b/drivers/mmc/Makefile
@@ -13,6 +13,7 @@
 obj-$(CONFIG_DAVINCI_MMC) += davinci_mmc.o
 obj-$(CONFIG_DWMMC) += dw_mmc.o
 obj-$(CONFIG_EXYNOS_DWMMC) += exynos_dw_mmc.o
+obj-$(CONFIG_HIKEY_DWMMC) += hi6220_dw_mmc.o
 obj-$(CONFIG_FSL_ESDHC) += fsl_esdhc.o
 obj-$(CONFIG_FTSDC010) += ftsdc010_mci.o
 obj-$(CONFIG_FTSDC021) += ftsdc021_sdhci.o