mtd: nand: drv: use get_nand_dev_by_index()

As part of preparation for nand DM conversion the new API has been
introduced to remove direct access to nand_info array. So, use it here
instead of accessing to nand_info array directly

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>

drivers/mtd/nand/fsmc_nand.c

@@ -409,7 +409,7 @@ int fsmc_nand_switch_ecc(uint32_t eccstrength)
 	 * Nomadik SoC is currently supporting this fsmc_nand_switch_ecc()
 	 * function, as it doesn't need to switch to a different ECC layout.
 	 */
-	mtd = nand_info[nand_curr_device];
+	mtd = get_nand_dev_by_index(nand_curr_device);
 	nand = mtd_to_nand(mtd);
 
 	/* Setup the ecc configurations again */

drivers/mtd/nand/zynq_nand.c

@@ -1008,7 +1008,7 @@ static int zynq_nand_init(struct nand_chip *nand_chip, int devnum)
 	}
 
 	xnand->nand_base = (void __iomem *)ZYNQ_NAND_BASEADDR;
-	mtd = (struct mtd_info *)&nand_info[0];
+	mtd = get_nand_dev_by_index(0);
 
 	nand_chip->priv = xnand;
 	mtd->priv = nand_chip;