net/mlx5e: Add flow_action to parse state

As a preparation for validating police action, adds flow_action to
parse state, which is to passed to parsing callbacks.

Signed-off-by: Jianbo Liu <jianbol@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>