net/mlx5: DR, Can't go to uplink vport on RX rule

Go-To-Vport action on RX is not allowed when the vport is uplink.
In such case, the packet should be dropped.

Fixes: 9db810ed ("net/mlx5: DR, Expose steering action functionality")
Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Reviewed-by: Erez Shitrit <erezsh@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>