Add VSC8572 and VSC8574 in the PTP configuration
as they also support PTP.
The relevant datasheets can be found here:
  - VSC8572: https://www.microchip.com/wwwproducts/en/VSC8572
  - VSC8574: https://www.microchip.com/wwwproducts/en/VSC8574
Signed-off-by: Steen Hegelund <steen.hegelund@microchip.com>
Link: https://lore.kernel.org/r/20201112092250.914079-1-steen.hegelund@microchip.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
 int vsc8584_ptp_init(struct phy_device *phydev)
 {
        switch (phydev->phy_id & phydev->drv->phy_id_mask) {
+       case PHY_ID_VSC8572:
+       case PHY_ID_VSC8574:
        case PHY_ID_VSC8575:
        case PHY_ID_VSC8582:
        case PHY_ID_VSC8584: