CPSW ia a gigabit device. Use the PHY_GBIT_FEATURES macro to determine phy
supported features.
Tested on cm_t335.
Signed-off-by: Ilya Ledvich <ilya@compulab.co.il>
 {
        struct cpsw_priv *priv = (struct cpsw_priv *)dev->priv;
        struct phy_device *phydev;
-       u32 supported = (SUPPORTED_10baseT_Half |
-                       SUPPORTED_10baseT_Full |
-                       SUPPORTED_100baseT_Half |
-                       SUPPORTED_100baseT_Full |
-                       SUPPORTED_1000baseT_Full);
+       u32 supported = PHY_GBIT_FEATURES;
 
        phydev = phy_connect(priv->bus,
                        slave->data->phy_addr,