sh: sh7757lcr: Add MMC header file of SH

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

board/renesas/sh7757lcr/sh7757lcr.c

@@ -24,6 +24,7 @@
 #include <malloc.h>
 #include <asm/processor.h>
 #include <asm/io.h>
+#include <asm/mmc.h>
 #include <spi_flash.h>
 
 int checkboard(void)