net/mlx5: handle RSS action in sample

net/mlx5: handle RSS action in sample

PMD validates the rss action in the sample sub-actions list,
then translates into rdma-core action and it will be used for sample
path destination.

If the RSS action is in both sample sub-actions list and original flow,
the rss level and rss type in the sample sub-actions list should be
consistent with the original flow list, since the expanding items
for RSS should be the same for both actions.

Signed-off-by: Jiawei Wang <jiaweiw@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>