mmc: dw-mmc: support DesignWare MMC Controller

Support the DesginWare MMC Controller.

---
Changelog V3:
- Modified the code with Andy's comments.
- Use the Label for descriptor
- Not include the board specific patch

---
 drivers/mmc/Makefile |    1 +
 drivers/mmc/dw_mmc.c |  385 ++++++++++++++++++++++++++++++++++++++++++++++++++
 include/dwmmc.h      |  191 +++++++++++++++++++++++++
 3 files changed, 577 insertions(+), 0 deletions(-)
 create mode 100644 drivers/mmc/dw_mmc.c
 create mode 100644 include/dwmmc.h

index 2b96cdc..9ef82a6 100644
@@ -47,6 +47,7 @@ COBJS-$(CONFIG_SDHCI) += sdhci.o
 COBJS-$(CONFIG_S5P_SDHCI) += s5p_sdhci.o
 COBJS-$(CONFIG_SH_MMCIF) += sh_mmcif.o
 COBJS-$(CONFIG_TEGRA_MMC) += tegra_mmc.o
+COBJS-$(CONFIG_DWMMC) += dw_mmc.o
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)

1.7.4.1