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/VSC8574

Signed-off-by: Steen Hegelund <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/phy/mscc/mscc_ptp.c

···
 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: