common/mlx5: add DevX commands for queue counters

common/mlx5: add DevX commands for queue counters

A queue counter set is an HW object that can be assigned to any RQ\QP
and it counts HW events on the assigned QPs\RQs.

Add DevX API to allocate and query queue counter set object.

The only used counter event is the "out of buffer" where the queue
drops packets when no SW buffer is available to receive it.

Cc: stable@dpdk.org
Signed-off-by: Matan Azrad <matan@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>