net: phy: mscc: Add PTP support for 2 more VSC PHYs

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/VSC8574Signed-off-by: Steen Hegelund <steen.hegelund@microchip.com>
Link: https://lore.kernel.org/r/20201112092250.914079-1-steen.hegelund@microchip.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/phy/mscc/mscc_ptp.c

@@ -1510,6 +1510,8 @@ void vsc8584_config_ts_intr(struct phy_device *phydev)
 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: