mtd: onenand: use mtd_set_ecclayout() where appropriate

Use the mtd_set_ecclayout() helper instead of directly assigning the
mtd->ecclayout field.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

drivers/mtd/onenand/onenand_base.c

@@ -3997,7 +3997,7 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 
 	mtd->oobavail = ret;
 
-	mtd->ecclayout = this->ecclayout;
+	mtd_set_ecclayout(mtd, this->ecclayout);
 	mtd->ecc_strength = 1;
 
 	/* Fill in remaining MTD driver data */