net: phy: Add phy_ethtool_nway_reset

This function just calls into genphy_restart_aneg() to perform an
autonegotation restart.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 9880d73..b9bd3b4 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -860,6 +860,7 @@ int phy_ethtool_get_link_ksettings(struct net_device *ndev,
 				   struct ethtool_link_ksettings *cmd);
 int phy_ethtool_set_link_ksettings(struct net_device *ndev,
 				   const struct ethtool_link_ksettings *cmd);
+int phy_ethtool_nway_reset(struct net_device *ndev);
 
 int __init mdio_bus_init(void);
 void mdio_bus_exit(void);