r8169: remove NETIF_F_HIGHDMA from vlan_features

NETIF_F_HIGHDMA is added to vlan_features by register_netdev(),
therefore we can omit this here.

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