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/Makefile b/drivers/mmc/Makefile
index a543188..f652baf 100644
--- a/drivers/mmc/Makefile
+++ b/drivers/mmc/Makefile
@@ -36,7 +36,7 @@
 obj-$(CONFIG_OMAP_HSMMC) += omap_hsmmc.o
 obj-$(CONFIG_X86) += pci_mmc.o
 obj-$(CONFIG_PXA_MMC_GENERIC) += pxa_mmc_gen.o
-obj-$(CONFIG_ROCKCHIP_DWMMC) += rockchip_dw_mmc.o
+obj-$(CONFIG_MMC_DW_ROCKCHIP) += rockchip_dw_mmc.o
 obj-$(CONFIG_SUPPORT_EMMC_RPMB) += rpmb.o
 obj-$(CONFIG_S3C_SDI) += s3c_sdi.o
 ifdef CONFIG_BLK