net: dsa: tag_sja1105: Constify dsa_device_ops

sja1105_netdev_ops should be const since that is what the DSA layer
expects.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/dsa/tag_sja1105.c

@@ -304,7 +304,7 @@ static struct sk_buff *sja1105_rcv(struct sk_buff *skb,
 					      is_meta);
 }
 
-static struct dsa_device_ops sja1105_netdev_ops = {
+static const struct dsa_device_ops sja1105_netdev_ops = {
 	.name = "sja1105",
 	.proto = DSA_TAG_PROTO_SJA1105,
 	.xmit = sja1105_xmit,