phylib: Silence driver registration

It gets quite verbose to see every single PHY driver being registered
by default.

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index c046121..f6e4848 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -706,7 +706,7 @@
 		return retval;
 	}
 
-	pr_info("%s: Registered new driver\n", new_driver->name);
+	pr_debug("%s: Registered new driver\n", new_driver->name);
 
 	return 0;
 }