mtd: nand: atmel_nand: constify atmel_nand_caps structures

All atmel_nand_caps are never modified, consitify them.

Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
Acked-by: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 6ecc1c1..f4e1f91 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -128,7 +128,7 @@
 
 	struct atmel_nfc	*nfc;
 
-	struct atmel_nand_caps	*caps;
+	const struct atmel_nand_caps	*caps;
 	bool			has_pmecc;
 	u8			pmecc_corr_cap;
 	u16			pmecc_sector_size;
@@ -2303,11 +2303,11 @@
 	return 0;
 }
 
-static struct atmel_nand_caps at91rm9200_caps = {
+static const struct atmel_nand_caps at91rm9200_caps = {
 	.pmecc_correct_erase_page = false,
 };
 
-static struct atmel_nand_caps sama5d4_caps = {
+static const struct atmel_nand_caps sama5d4_caps = {
 	.pmecc_correct_erase_page = true,
 };