net/mlx5: HWS, added vport handling

Vport is a virtual eswitch port that is associated with its virtual
function (VF), physical function (PF) or sub-function (SF).
This patch adds handling of vports in HWS.

Reviewed-by: Hamdan Agbariya <hamdani@nvidia.com>
Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>