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/arch/arm/include/asm/arch-hi6220/dwmmc.h b/arch/arm/include/asm/arch-hi6220/dwmmc.h
new file mode 100644
index 0000000..c747383
--- /dev/null
+++ b/arch/arm/include/asm/arch-hi6220/dwmmc.h
@@ -0,0 +1,8 @@
+/*
+ * (C) Copyright 2015 Linaro
+ * Peter Griffin <peter.griffin@linaro.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+int hi6220_dwmci_add_port(int index, u32 regbase, int bus_width);