mmc: rockchip: rename CONFIG_ROCKCHIP_SDHCI to CONFIG_MMC_SDHCI_ROCKCHIP

Make the naming scheme consistent; all SDHCI-base drivers prefixed
with CONFIG_MMC_SDHCI_.

While we are here, add "depends on ARCH_ROCKCHIP".

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/configs/evb-rk3399_defconfig b/configs/evb-rk3399_defconfig
index ca292cf..47064f9 100644
--- a/configs/evb-rk3399_defconfig
+++ b/configs/evb-rk3399_defconfig
@@ -18,7 +18,7 @@
 CONFIG_ROCKCHIP_GPIO=y
 CONFIG_MMC_DW=y
 CONFIG_MMC_DW_ROCKCHIP=y
-CONFIG_ROCKCHIP_SDHCI=y
+CONFIG_MMC_SDHCI_ROCKCHIP=y
 CONFIG_MMC_SDHCI=y
 CONFIG_PINCTRL=y
 CONFIG_ROCKCHIP_RK3399_PINCTRL=y