net/mlx5: locate aging pools in the general container

net/mlx5: locate aging pools in the general container

Commit [1] introduced different container for the aging counter
pools. In order to save container memory the aging counter pools
can be located in the general pool container.

This patch locates the aging counter pools in the general pool
container. Remove the aging container management.

[1] commit fd143711a6ea ("net/mlx5: separate aging counter pool range")

Signed-off-by: Suanming Mou <suanmingm@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>