r8169: don't set bit RxVlan on RTL8125

RTL8125 uses a different register for VLAN offloading config,
therefore don't set bit RxVlan.

Fixes: f1bce4ad ("r8169: add support for RTL8125")
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>