net/mlx5: support VLAN matching fields

net/mlx5: support VLAN matching fields

The fields ``has_vlan`` and ``has_more_vlan`` were added in rte_flow by
patch [1].

Using these fields, the application can match all the VLAN options by
single flow: any, VLAN only and non-VLAN only.

Add the support for the fields.
By the way, add the support for QinQ packets matching.

VLAN\QinQ limitations are listed in the driver document.

[1] https://patches.dpdk.org/patch/80965/

Signed-off-by: Matan Azrad <matan@nvidia.com>
Acked-by: Dekel Peled <dekelp@nvidia.com>
Acked-by: Ori Kam <orika@nvidia.com>