mtd: introduce mtd_resume interface

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
index 7a028cf..8544d6b 100644
--- a/drivers/mtd/nand/pxa3xx_nand.c
+++ b/drivers/mtd/nand/pxa3xx_nand.c
@@ -1291,7 +1291,7 @@
 	nand_writel(info, NDSR, NDSR_MASK);
 	for (cs = 0; cs < pdata->num_cs; cs++) {
 		mtd = info->host[cs]->mtd;
-		mtd->resume(mtd);
+		mtd_resume(mtd);
 	}
 
 	return 0;