mtd: constify mtd_partition

mtd_partition are not supposed to change at runtime.
Functions 'mtd_device_parse_register' working with const mtd_partition
provided by <linux/mtd/mtd.h>. So mark the non-const structs as const.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

drivers/mtd/devices/lart.c

@@ -583,7 +583,7 @@ static struct mtd_erase_region_info erase_regions[] = {
 	}
 };
 
-static struct mtd_partition lart_partitions[] = {
+static const struct mtd_partition lart_partitions[] = {
 	/* blob */
 	{
 		.name	= "blob",