net: ethernet: Use phy_set_max_speed() to limit advertised speed

Many Ethernet MAC drivers want to limit the PHY to only advertise a
maximum speed of 100Mbs or 1Gbps. Rather than using a mask, make use
of the helper function phy_set_max_speed().

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/ethoc.c

@@ -721,10 +721,7 @@ static int ethoc_mdio_probe(struct net_device *dev)
 		return err;
 	}
 
-	phy->advertising &= ~(ADVERTISED_1000baseT_Full |
-			      ADVERTISED_1000baseT_Half);
-	phy->supported &= ~(SUPPORTED_1000baseT_Full |
-			    SUPPORTED_1000baseT_Half);
+	phy_set_max_speed(phy, SPEED_100);
 
 	return 0;
 }