net: mvneta: mark symbols static where possible

We get 2 warnings when building kernel with W=1:
drivers/net/ethernet/marvell/mvneta.c:639:27: warning: no previous prototype for 'mvneta_get_stats64' [-Wmissing-prototypes]
drivers/net/ethernet/marvell/mvneta.c:3529:5: warning: no previous prototype for 'mvneta_ethtool_set_link_ksettings' [-Wmissing-prototypes]

In fact, these two functions are only used in the file in which they are
declared and don't need a declaration, but can be made static.
so this patch marks these functions with 'static'.
Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/mvneta.c

@@ -634,7 +634,8 @@ static void mvneta_mib_counters_clear(struct mvneta_port *pp)
 }
 
 /* Get System Network Statistics */
-struct rtnl_link_stats64 *mvneta_get_stats64(struct net_device *dev,
+static struct rtnl_link_stats64 *
+mvneta_get_stats64(struct net_device *dev,
 		   struct rtnl_link_stats64 *stats)
 {
 	struct mvneta_port *pp = netdev_priv(dev);
@@ -3506,7 +3507,8 @@ static int mvneta_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 /* Ethtool methods */
 
 /* Set link ksettings (phy address, speed) for ethtools */
-int mvneta_ethtool_set_link_ksettings(struct net_device *ndev,
+static int
+mvneta_ethtool_set_link_ksettings(struct net_device *ndev,
 				  const struct ethtool_link_ksettings *cmd)
 {
 	struct mvneta_port *pp = netdev_priv(ndev);