net: atlantic: MACSec egress offload implementation

This patch adds support for MACSec egress HW offloading on Atlantic
network cards.

Signed-off-by: Dmitry Bogdanov <[email protected]>
Signed-off-by: Mark Starovoytov <[email protected]>
Signed-off-by: Igor Russkikh <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: logost