net: phy: Add more 1000BaseX support detection

Commit "net: phy: Add detection of 1000BaseX link mode support" added
support for not filtering out 1000BaseX mode from the PHY's supported
modes in genphy_config_init, but we have to make a similar change in
genphy_read_abilities in order to actually detect it as a supported mode
in the first place. Add this in.
Signed-off-by: Robert Hancock <hancock@sedsystems.ca>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/phy_device.c

@@ -1984,6 +1984,8 @@ int genphy_read_abilities(struct phy_device *phydev)
 				 phydev->supported, val & ESTATUS_1000_TFULL);
 		linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
 				 phydev->supported, val & ESTATUS_1000_THALF);
+		linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
+				 phydev->supported, val & ESTATUS_1000_XFULL);
 	}
 
 	return 0;