mtd: nand: convert to nand_set_flash_node()

Used semantic patch with 'make coccicheck MODE=patch COCCI=script.cocci':

---8<----
virtual patch

@@
struct nand_chip *c;
struct device_node *d;
@@
-(c)->flash_node = (d)
+nand_set_flash_node(c, d)
---8<----

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
diff --git a/drivers/mtd/nand/fsmc_nand.c b/drivers/mtd/nand/fsmc_nand.c
index 07af3dc..6f9e422 100644
--- a/drivers/mtd/nand/fsmc_nand.c
+++ b/drivers/mtd/nand/fsmc_nand.c
@@ -1033,7 +1033,7 @@
 	nand->options = pdata->options;
 	nand->select_chip = fsmc_select_chip;
 	nand->badblockbits = 7;
-	nand->flash_node = np;
+	nand_set_flash_node(nand, np);
 
 	if (pdata->width == FSMC_NAND_BW16)
 		nand->options |= NAND_BUSWIDTH_16;