net/mlx5: Introduce access functions to modify/query vport mac lists

net/mlx5: Introduce access functions to modify/query vport mac lists

BugLink: http://bugs.launchpad.net/bugs/1540435
Those functions are needed to notify the upcoming L2 table and SR-IOV
E-Switch(FDB) manager(PF), of the NIC vport (vf) UC/MC mac lists
changes.

preperation for ethernet sriov and l2 table management.

Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit e16aea2744abea612c27ee0eef606c6a6a8204de)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>