qed*: Allow unicast filtering

qed*: Allow unicast filtering

Orabug: 25477939

Apparently qede fails to set IFF_UNICAST_FLT, and as a result is not
actually performing unicast MAC filtering.
While we're at it - relax a hard-coded limitation that limits each
interface into using at most 15 unicast MAC addresses before turning
promiscuous. Instead utilize the HW resources to their limit.

Signed-off-by: Yuval Mintz <Yuval.Mintz@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 7b7e70f979e34ed84d725eab8ea42921ab6f42e3)
Signed-off-by: Brian Maly <brian.maly@oracle.com>