phy: Centralise print about attached phy

Many Ethernet drivers contain the same netdev_info() print statement
about the attached phy. Move it into the phy device code. Additionally
add a varargs function which can be used to append additional
information.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 2f6c974..9e20f37 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -927,8 +927,7 @@
 	/* 10BASE is not supported */
 	phydev->supported &= ~PHY_10BT_FEATURES;
 
-	netdev_info(ndev, "attached PHY %d (IRQ %d) to driver %s\n",
-		    phydev->addr, phydev->irq, phydev_name(phydev));
+	phy_attached_info(phydev);
 
 	priv->phydev = phydev;