net/mlx5: allow port start with zero Rx queue

net/mlx5: allow port start with zero Rx queue

During port start, function mlx5_ctrl_flow_vlan() is called to create
default ingress flow rules.
For specific use-cases, a port can be used for Tx only.
In such case, number of Rx queues can be set to 0 to save resources,
hence the default ingress rules are irrelevant.

This patch modifies function mlx5_ctrl_flow_vlan() to avoid the
creation of the default ingress rules when number of Rx queues is 0.
It also includes update of validation functions for relevant actions,
mlx5_flow_validate_action_queue() and mlx5_flow_validate_action_rss(),
to prevent creation of flow rules with these actions when number of Rx
queues is 0.

Signed-off-by: Dekel Peled <dekelp@mellanox.com>
Acked-by: Shahaf Shuler <shahafs@mellanox.com>