phylib: Silence driver registration

It gets quite verbose to see every single PHY driver being registered
by default.
Signed-off-by: NOlof Johansson <olof@lixom.net>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/net/phy/phy_device.c

@@ -706,7 +706,7 @@ int phy_driver_register(struct phy_driver *new_driver)
 		return retval;
 	}
 
-	pr_info("%s: Registered new driver\n", new_driver->name);
+	pr_debug("%s: Registered new driver\n", new_driver->name);
 
 	return 0;
 }