r8169: remove not needed debug print in rtl8169_init_phy

Remove a useless debug statement. This also allows to remove the
net_device parameter from rtl8169_init_phy().

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>