net/mlx5: fix external Rx queue referencing

net/mlx5: fix external Rx queue referencing

When an indirection table object is modified, it updates the reference
counter for each RX queue related to it.

The reference counter for regular queues are indeed updated. However,
the reference counter for external RxQs are not.

This patch adds updating for external RxQs too.

Fixes: 311b17e669ab ("net/mlx5: support queue/RSS actions for external Rx queue")
Signed-off-by: Michael Baum <michaelba@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>