phy.c: make less verbose - turn printf() into debug()

The PHY driver was too verbose and corrupted the boot message display
like this:

	...
	Net:   TSEC0 connected to Marvell 88E1111S
	TSEC1 connected to Marvell 88E1111S
	TSEC0, TSEC1
	...

Turn printf() into debug() so we het the expected output again:

	...
	Net:   TSEC0, TSEC1
	...
Signed-off-by: NWolfgang Denk <wd@denx.de>
Cc: Kumar Gala <galak@kernel.crashing.org>

drivers/net/phy/phy.c

@@ -714,7 +714,7 @@ struct phy_device *phy_connect(struct mii_dev *bus, int addr,
 
 	phydev->dev = dev;
 
-	printf("%s connected to %s\n", dev->name, phydev->drv->name);
+	debug("%s connected to %s\n", dev->name, phydev->drv->name);
 
 	return phydev;
 }