net: benet: convert to hw_features - fixup

Fix up after merge with NETIF_F_RXHASH implementation.

This allows to toggle NETIF_F_RXHASH and NETIF_F_HW_VLAN_TX.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>