mmc: fsl_esdhc: remove the duplicated header file

"mmc.h" is already included. It's duplicated.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/mmc/fsl_esdhc.c

@@ -16,7 +16,6 @@
 #include <mmc.h>
 #include <part.h>
 #include <malloc.h>
-#include <mmc.h>
 #include <fsl_esdhc.h>
 #include <fdt_support.h>
 #include <asm/io.h>