mx6: wandboard: fix warning due to missing prototype

Signed-off-by: Stefano Babic <sbabic@denx.de>
CC: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>

board/wandboard/wandboard.c

@@ -19,6 +19,7 @@
 #include <asm/imx-common/mxc_i2c.h>
 #include <asm/imx-common/boot_mode.h>
 #include <asm/imx-common/video.h>
+#include <asm/imx-common/sata.h>
 #include <asm/io.h>
 #include <linux/sizes.h>
 #include <common.h>