net/mlx5: E-Switch, Introduce Vport administration functions

Implement set VF mac/link state and query VF config
to be used later in nedev VF ndos or any other management API.

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>