mmc: Rename MMC_SUPPORT to MMC

Rename these options so that CONFIG_IS_ENABLED can be used with them.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
[trini: Fixup some incorrect renames]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/sifive_unleashed_defconfig b/configs/sifive_unleashed_defconfig
index be947be..c2ec68d 100644
--- a/configs/sifive_unleashed_defconfig
+++ b/configs/sifive_unleashed_defconfig
@@ -5,7 +5,7 @@
 CONFIG_SYS_MALLOC_LEN=0x800000
 CONFIG_SPL_DM_SPI=y
 CONFIG_DEFAULT_DEVICE_TREE="hifive-unleashed-a00"
-CONFIG_SPL_MMC_SUPPORT=y
+CONFIG_SPL_MMC=y
 CONFIG_SPL=y
 CONFIG_SPL_SPI_FLASH_SUPPORT=y
 CONFIG_SPL_SPI_SUPPORT=y