common/mlx5: fix relaxed ordering count object

common/mlx5: fix relaxed ordering count object

In order to improve performance relaxed ordering was enabled
when creating count object using Devx.

Currently rte enables this optimization by default when using
Devx.

This causes an issue when using firmware that does not have this
capability causing a count object failure.

In order to fix this issue a check of firmware capabilities was
added before enabling relaxed ordering.

Fixes: 53ac93f71ad1 ("net/mlx5: create relaxed ordering memory regions")
Signed-off-by: Shiri Kuzin <shirik@mellanox.com>
Acked-by: Matan Azrad <matan@mellanox.com>