net/mlx5: translate shared action for RSS action

net/mlx5: translate shared action for RSS action

Handle shared action on flow validation/creation/destruction.
mlx5 PMD translates shared action into a regular one before handling
flow validation/creation. The shared action translation applied to
utilize the same execution path for both shared and regular actions.
The current implementation supports shared action translation for shared
RSS action only.

RSS action validation split to validate shared RSS action on its
creation in addition to action validation in flow validation/creation
path.

Implement rte_flow shared action API for mlx5 PMD, mostly forwarding
calls to flow driver operations (see struct mlx5_flow_driver_ops).

Signed-off-by: Andrey Vesnovaty <andreyv@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>