mmc: move DesignWare-based drivers to Kconfig

Move (and rename) the following CONFIG options to Kconfig:

  CONFIG_EXYNOS_DWMMC  (renamed to CONFIG_MMC_DW_EXYNOS)
  CONFIG_HIKEY_DWMMC   (renamed to CONFIG_MMC_DW_K3)
  CONFIG_SOCFPGA_DWMMC (renamed to CONFIG_MMC_DW_SOCFPGA)

The "HIKEY" is a board name, so it is not suitable for the MMC
controller name.  I am following the name used in Linux.

This commit was generated as follows:

[1] Rename the config options with the following command:
find . -name .git -prune -o ! -path ./scripts/config_whitelist.txt \
-type f -print | xargs sed -i -e '
s/CONFIG_EXYNOS_DWMMC/CONFIG_MMC_DW_EXYNOS/g
s/CONFIG_HIKEY_DWMMC/CONFIG_MMC_DW_K3/g
s/CONFIG_SOCFPGA_DWMMC/CONFIG_MMC_DW_SOCFPGA/g
'

[2] Commit the changes

[3] Create the entries in drivers/mmc/Kconfig
    (with default y for EXYNOS and SOCFPGA)

[4] Run the following:
tools/moveconfig.py -y -r HEAD MMC_DW_EXYNOS MMC_DW_K3 MMC_DW_SOCFPGA

[5] Sort and align drivers/mmc/Makefile for readability

[6] Clean-up doc/README.socfpga by hand

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Marek Vasut <marex@denx.de>
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index 44f58b4..f99264d 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -75,6 +75,24 @@
 	  block, this provides host support for SD and MMC interfaces, in both
 	  PIO, internal DMA mode and external DMA mode.
 
+config MMC_DW_EXYNOS
+	bool "Exynos specific extensions for Synopsys DW Memory Card Interface"
+	depends on ARCH_EXYNOS
+	depends on MMC_DW
+	default y
+	help
+	  This selects support for Samsung Exynos SoC specific extensions to the
+	  Synopsys DesignWare Memory Card Interface driver. Select this option
+	  for platforms based on Exynos4 and Exynos5 SoC's.
+
+config MMC_DW_K3
+	bool "K3 specific extensions for Synopsys DW Memory Card Interface"
+	depends on MMC_DW
+	help
+	  This selects support for Hisilicon K3 SoC specific extensions to the
+	  Synopsys DesignWare Memory Card Interface driver. Select this option
+	  for platforms based on Hisilicon K3 SoC's.
+
 config MMC_DW_ROCKCHIP
 	bool "Rockchip SD/MMC controller support"
 	depends on DM_MMC && OF_CONTROL
@@ -85,6 +103,16 @@
 	  SD 3.0, SDIO 3.0 and MMC 4.5 and supports common eMMC chips as well
 	  as removeable SD and micro-SD cards.
 
+config MMC_DW_SOCFPGA
+	bool "SOCFPGA specific extensions for Synopsys DW Memory Card Interface"
+	depends on ARCH_SOCFPGA
+	depends on MMC_DW
+	default y
+	help
+	  This selects support for Altera SOCFPGA specific extensions to the
+	  Synopsys DesignWare Memory Card Interface driver. Select this option
+	  for platforms based on Altera SOCFPGA.
+
 config SH_SDHI
 	bool "SuperH/Renesas ARM SoCs on-chip SDHI host controller support"
 	depends on RMOBILE