r8169: move enabling EEE to rtl8169_init_phy

Simplify the code by moving the call to rtl_enable_eee() from the
individual PHY configs to rtl8169_init_phy().

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