net: macsec: support multicast/broadcast when offloading

The idea is simple. If the frame is an exact match for the controlled port
(based on DA comparison), then we simply divert this skb to matching port.

Multicast/broadcast messages are delivered to all ports.

Change-Id: Iaa716e14c1a178a99b51b1104e7c68eb2f8e592e
Signed-off-by: Mark Starovoytov <mstarovoitov@marvell.com>
Signed-off-by: Igor Russkikh <irusskikh@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Git-commit: f428011b90ec0de7429886f753b7c3293392761c
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Karthik Rudrapatna <quic_krudrapa@quicinc.com>