r8169: use rtl8169_set_features in rtl8169_init_one

At that place in rtl_init_one() we can safely use rtl8169_set_features()
to configure the chip according to the default features.

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