net/mlx5: fix VLAN push action validation

net/mlx5: fix VLAN push action validation

Flow domain and direction was validated when OF_PUSH_VLAN action
appears in flow actions. Flow was rejected whenever this action:

- was used in NIC domain, in ingress direction;
- was used in FDB domain, in ingress direction, on ConnectX-5.

This validation logic rejected a valid case when the OF_PUSH_VLAN
action was used when directing traffic to the hairpin queue,
configured in TX implicit mode.

This patch moves code responsible for OF_PUSH_VLAN validation of
domain and direction from flow_dv_validate_push_vlan() to
flow_dv_validate(). Domain and direction are now validated when either
non-hairpin queue is used or hairpin queue is configured in Tx explicit
mode.

Fixes: 96f85ec489db ("net/mlx5: check VLAN push/pop support")
Cc: stable@dpdk.org
Signed-off-by: Dariusz Sosnowski <dsosnowski@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>