nand: constify id/manu tables

These id tables need not be writable.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/drivers/mtd/nand/nand_ids.c b/drivers/mtd/nand/nand_ids.c
index 25b22ec..8d7ea76 100644
--- a/drivers/mtd/nand/nand_ids.c
+++ b/drivers/mtd/nand/nand_ids.c
@@ -22,7 +22,7 @@
 +	256	256 Byte page size
 *	512	512 Byte page size
 */
-struct nand_flash_dev nand_flash_ids[] = {
+const struct nand_flash_dev nand_flash_ids[] = {
 
 #ifdef CONFIG_MTD_NAND_MUSEUM_IDS
 	{"NAND 1MiB 5V 8-bit",		0x6e, 256, 1, 0x1000, 0},
@@ -132,7 +132,7 @@
 /*
 *	Manufacturer ID list
 */
-struct nand_manufacturers nand_manuf_ids[] = {
+const struct nand_manufacturers nand_manuf_ids[] = {
 	{NAND_MFR_TOSHIBA, "Toshiba"},
 	{NAND_MFR_SAMSUNG, "Samsung"},
 	{NAND_MFR_FUJITSU, "Fujitsu"},