net/mlx5: fix metering cleanup on stop

net/mlx5: fix metering cleanup on stop

A meter may handle Rx queue reference in his sub-policies.
In stop operation, all the Rx queues are released.

Wrongly, the meter reference was not released before
destroying the Rx queues what cause an error in stop.

Release the Rx queues meter references in stop operation.

Fixes: fc6ce56bba05 ("net/mlx5: prepare sub-policy for flow with meter")

Signed-off-by: Li Zhang <lizh@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>