mtd: samsung: Constify platform_device_id

The platform_device_id is not modified by the driver and core uses it as
const.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
diff --git a/drivers/mtd/onenand/samsung.c b/drivers/mtd/onenand/samsung.c
index 19cfb97..7392595 100644
--- a/drivers/mtd/onenand/samsung.c
+++ b/drivers/mtd/onenand/samsung.c
@@ -1083,7 +1083,7 @@
 	.resume		= s3c_pm_ops_resume,
 };
 
-static struct platform_device_id s3c_onenand_driver_ids[] = {
+static const struct platform_device_id s3c_onenand_driver_ids[] = {
 	{
 		.name		= "s3c6400-onenand",
 		.driver_data	= TYPE_S3C6400,