stmmac: intel: prepare to support 1000BASE-X phy interface setting

Currently, intel_speed_mode_2500() redundantly fix-up phy_interface to
PHY_INTERFACE_MODE_SGMII if the underlying controller is in 1000Mbps
SGMII mode. The value of phy_interface has been initialized earlier.

This patch removes such redundancy to prepare for setting 1000BASE-X
mode for certain hardware platform configuration.

Also update the intel_mgbe_common_data() to include 1000BASE-X setup.
Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c

@@ -251,7 +251,6 @@ static void intel_speed_mode_2500(struct net_device *ndev, void *intel_data)
 		priv->plat->mdio_bus_data->xpcs_an_inband = false;
 	} else {
 		priv->plat->max_speed = 1000;
-		priv->plat->phy_interface = PHY_INTERFACE_MODE_SGMII;
 		priv->plat->mdio_bus_data->xpcs_an_inband = true;
 	}
 }
@@ -562,7 +561,8 @@ static int intel_mgbe_common_data(struct pci_dev *pdev,
 	plat->vlan_fail_q = plat->rx_queues_to_use - 1;
 
 	/* Intel mgbe SGMII interface uses pcs-xcps */
-	if (plat->phy_interface == PHY_INTERFACE_MODE_SGMII) {
+	if (plat->phy_interface == PHY_INTERFACE_MODE_SGMII ||
+	    plat->phy_interface == PHY_INTERFACE_MODE_1000BASEX) {
 		plat->mdio_bus_data->has_xpcs = true;
 		plat->mdio_bus_data->xpcs_an_inband = true;
 	}