NAND: MXS: include common.h first so cache.h is included in correct order

With Simon Glass's include/nand.h alignment changes, some mxs builds
were generating errors. Fix is to ensure asm/cache.h is included before
linux/mtd/nand.h. Moving common.h to top of include list does that.
Signed-off-by: NTom Warren <twarren@nvidia.com>
Acked-by: NSimon Glass <sjg@chromium.org>
Acked-by: NMarek Vasut <marex@denx.de>

drivers/mtd/nand/mxs_nand.c

@@ -25,10 +25,10 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+#include <common.h>
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/nand.h>
 #include <linux/types.h>
-#include <common.h>
 #include <malloc.h>
 #include <asm/errno.h>
 #include <asm/io.h>