ethernet: amd: au1000: Remove pointless warning

The warning about being able to read any MDIO device, not just the
attached ethernet devices PHY applies to all MDIO drivers. So remove
it. This also removes a reference to a member in phy_device which has
moved.
Signed-off-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/amd/au1000_eth.c

@@ -344,9 +344,6 @@ static void au1000_mdio_write(struct net_device *dev, int phy_addr,
 
 static int au1000_mdiobus_read(struct mii_bus *bus, int phy_addr, int regnum)
 {
-	/* WARNING: bus->phy_map[phy_addr].attached_dev == dev does
-	 * _NOT_ hold (e.g. when PHY is accessed through other MAC's MII bus)
-	 */
 	struct net_device *const dev = bus->priv;
 
 	/* make sure the MAC associated with this