Remove structs which are no longer used in the driver:
  mlx5dr_cmd_qp_create_attr
  mlx5_fs_dr_ns
  mlx5_pas
Signed-off-by: NGal Pressman <gal@nvidia.com>
Reviewed-by: NLeon Romanovsky <leonro@nvidia.com>
Signed-off-by: NSaeed Mahameed <saeedm@nvidia.com>