mmc: rename CONFIG_ROCKCHIP_DWMMC to CONFIG_MMC_DW_ROCKCHIP

I am trying to make all DesignWare-based driver options prefixed
with CONFIG_MMC_DW_.

This commit was generated as follows:

find . -name .git -prune -o -type f -print | \
xargs sed -i -e 's/ROCKCHIP_DWMMC/MMC_DW_ROCKCHIP/g'

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 5b2b6a2..e1f8f9d 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -68,7 +68,7 @@
 	  It is compliant with the SD Host Controller Standard V3.0
 	  specification.
 
-config ROCKCHIP_DWMMC
+config MMC_DW_ROCKCHIP
 	bool "Rockchip SD/MMC controller support"
 	depends on DM_MMC && OF_CONTROL
 	help