bcm63xx-enet: fix PHY name to match MDIO bus name

Commit 3e61750: bcm63xx_enet: use an unique MDIO bus name introduced
a regression in the PHY connection logic, since the PHY name was formatted
to expect the bus name to be "0" or "1", whereas it is now "bcm63xx-enet-0"
or "bcm63xx-enet-1".

Reported-by: Joel EJC <joel_ejc@yahoofr>
Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bcm63xx_enet.c

@@ -797,7 +797,7 @@ static int bcm_enet_open(struct net_device *dev)
 	if (priv->has_phy) {
 		/* connect to PHY */
 		snprintf(phy_id, sizeof(phy_id), PHY_ID_FMT,
-			 priv->mac_id ? "1" : "0", priv->phy_id);
+			 priv->mii_bus->id, priv->phy_id);
 
 		phydev = phy_connect(dev, phy_id, bcm_enet_adjust_phy_link, 0,
 				     PHY_INTERFACE_MODE_MII);