fsl_pq_mdio: Revive UCC MDIO support

commit 1577ecef766650a57fceb171acee2b13cbfaf1d3 ("netdev: Merge UCC
and gianfar MDIO bus drivers") introduced a regression so that UCC
MDIO buses no longer work.

This is because fsl_pq_mdio driver wrongly masks all non-TBI PHYs
for !fsl,gianfar-mdio buses, while it should do that only for
fsl,gianfar-tbi buses.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/fsl_pq_mdio.c

@@ -387,7 +387,7 @@ static int fsl_pq_mdio_probe(struct of_device *ofdev,
 	 * The TBIPHY-only buses will find PHYs at every address,
 	 * so we mask them all but the TBI
 	 */
-	if (!of_device_is_compatible(np, "fsl,gianfar-mdio"))
+	if (of_device_is_compatible(np, "fsl,gianfar-tbi"))
 		new_bus->phy_mask = ~(1 << tbiaddr);
 
 	err = mdiobus_register(new_bus);