sh: fix build error in board-sh7757lcr.c

Fix the problem that the sh_mobile_sdhi.h changed the directory from
"linux/mfd/" to "linux/mmc/".
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/boards/board-sh7757lcr.c

@@ -17,7 +17,7 @@
 #include <linux/io.h>
 #include <linux/mmc/host.h>
 #include <linux/mmc/sh_mmcif.h>
-#include <linux/mfd/sh_mobile_sdhi.h>
+#include <linux/mmc/sh_mobile_sdhi.h>
 #include <cpu/sh7757.h>
 #include <asm/sh_eth.h>
 #include <asm/heartbeat.h>