net/fsl: constify of_device_id array

of_device_id is always used as const.
(See driver.of_match_table and open firmware functions)

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/freescale/fs_enet/mii-fec.c b/drivers/net/ethernet/freescale/fs_enet/mii-fec.c
index 1648e35..2be383e 100644
--- a/drivers/net/ethernet/freescale/fs_enet/mii-fec.c
+++ b/drivers/net/ethernet/freescale/fs_enet/mii-fec.c
@@ -95,7 +95,7 @@
 
 }
 
-static struct of_device_id fs_enet_mdio_fec_match[];
+static const struct of_device_id fs_enet_mdio_fec_match[];
 static int fs_enet_mdio_probe(struct platform_device *ofdev)
 {
 	const struct of_device_id *match;
@@ -208,7 +208,7 @@
 	return 0;
 }
 
-static struct of_device_id fs_enet_mdio_fec_match[] = {
+static const struct of_device_id fs_enet_mdio_fec_match[] = {
 	{
 		.compatible = "fsl,pq1-fec-mdio",
 	},