s390/qeth: advertise IFF_UNICAST_FLT

qeth implements HW-based Unicast Filtering (via SETVMAC) on L2 devices.
Tell the stack, so it knows that receiving traffic for secondary
addresses doesn't require full-blown promiscuous mode.
Signed-off-by: NJulian Wiedmann <jwi@linux.vnet.ibm.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/s390/net/qeth_l2_main.c

@@ -975,6 +975,7 @@ static int qeth_l2_setup_netdev(struct qeth_card *card)
 		return -ENODEV;
 
 	card->dev->ml_priv = card;
+	card->dev->priv_flags |= IFF_UNICAST_FLT;
 	card->dev->watchdog_timeo = QETH_TX_TIMEOUT;
 	card->dev->mtu = card->info.initial_mtu;
 	card->dev->min_mtu = 64;