net: mvneta: make mvneta_eth_tool_ops static

The mvneta_eth_tool_ops is only used internally in mvneta driver, so
make it static.
Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/mvneta.c

@@ -3959,7 +3959,7 @@ static const struct net_device_ops mvneta_netdev_ops = {
 	.ndo_do_ioctl        = mvneta_ioctl,
 };
 
-const struct ethtool_ops mvneta_eth_tool_ops = {
+static const struct ethtool_ops mvneta_eth_tool_ops = {
 	.nway_reset	= phy_ethtool_nway_reset,
 	.get_link       = ethtool_op_get_link,
 	.set_coalesce   = mvneta_ethtool_set_coalesce,