MMC / TMIO: Fix build issue related to struct scatterlist

Fix build issue caused by undefined struct scatterlist in
drivers/mmc/host/tmio_mmc.c.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/mmc/host/tmio_mmc.h

@@ -21,6 +21,7 @@
 #include <linux/mutex.h>
 #include <linux/pagemap.h>
 #include <linux/spinlock.h>
+#include <linux/scatterlist.h>
 
 /* Definitions for values the CTRL_SDIO_STATUS register can take. */
 #define TMIO_SDIO_STAT_IOIRQ	0x0001