net/mlx5: TC, allow offload from uplink to other PF's VF

Redirecting traffic from uplink to a VF is a legal operation of
mulitport eswitch mode. Remove the limitation.

Fixes: 94db3317 ("net/mlx5: Support multiport eswitch mode")
Signed-off-by: Eli Cohen <elic@nvidia.com>
Reviewed-by: Maor Dickman <maord@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>