net: phy: mscc: remove non-MACSec compatible phy

Selecting VSC8575 as a MACSec PHY was not correct

The relevant datasheet can be found here:
  - VSC8575: https://www.microchip.com/wwwproducts/en/VSC8575

History:
v1 -> v2:
   - Corrected the sha in the "Fixes:" tag

Fixes: 1bbe0ecc ("net: phy: mscc: macsec initialization")
Signed-off-by: Steen Hegelund <steen.hegelund@microchip.com>
Reviewed-by: Antoine Tenart <atenart@kernel.org>
Link: https://lore.kernel.org/r/20201113091116.1102450-1-steen.hegelund@microchip.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/phy/mscc/mscc_macsec.c

@@ -981,7 +981,6 @@ int vsc8584_macsec_init(struct phy_device *phydev)
 
 	switch (phydev->phy_id & phydev->drv->phy_id_mask) {
 	case PHY_ID_VSC856X:
-	case PHY_ID_VSC8575:
 	case PHY_ID_VSC8582:
 	case PHY_ID_VSC8584:
 		INIT_LIST_HEAD(&vsc8531->macsec_flows);