net: phy: mediatek: remove PHY mode check on MT7531

The function mt7531_phy_mode_supported in the DSA driver set supported
mode to PHY_INTERFACE_MODE_GMII instead of PHY_INTERFACE_MODE_INTERNAL
for the internal PHY, so this check breaks the PHY initialization:

mt7530 mdio-bus:00 wan (uninitialized): failed to connect to PHY: -EINVAL

Remove the check to make it work again.
Reported-by: Hauke Mehrtens <hauke@hauke-m.de>
Fixes: e40d2cca ("net: phy: add MediaTek Gigabit Ethernet PHY driver")
Signed-off-by: DENG Qingfang <dqfext@gmail.com>
Acked-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Tested-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/mediatek-ge.c

@@ -55,9 +55,6 @@ static int mt7530_phy_config_init(struct phy_device *phydev)
 
 static int mt7531_phy_config_init(struct phy_device *phydev)
 {
-	if (phydev->interface != PHY_INTERFACE_MODE_INTERNAL)
-		return -EINVAL;
-
 	mtk_gephy_config_init(phydev);
 
 	/* PHY link down power saving enable */