net/mlx5: fix shared RSS capability check

net/mlx5: fix shared RSS capability check

Existing code to create shared RSS action doesn't fully check
driver capabilities.
Using older driver, if DevX capabilities are insufficient,
the IBV operations are used.
In this case the ind_table_modify operation is not supported, and
shared RSS action can't be modified after creation.

This patch adds check of driver capability, and fails the validation
for shared RSS action in case it is insufficient.

Fixes: d2046c09aa64 ("net/mlx5: support shared action for RSS")
Cc: stable@dpdk.org
Signed-off-by: Dekel Peled <dekelp@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>