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/board/compulab/cm_fx6/spl.c b/board/compulab/cm_fx6/spl.c
index c3c8161..363458d 100644
--- a/board/compulab/cm_fx6/spl.c
+++ b/board/compulab/cm_fx6/spl.c
@@ -350,7 +350,7 @@
 	}
 }
 
-#ifdef CONFIG_SPL_MMC_SUPPORT
+#ifdef CONFIG_SPL_MMC
 static struct fsl_esdhc_cfg usdhc_cfg = {
 	.esdhc_base = USDHC3_BASE_ADDR,
 	.max_bus_width = 4,