net/mlx5: fix VLAN push action on hairpin queue

net/mlx5: fix VLAN push action on hairpin queue

Push VLAN action is allowed on Tx only, same as encap action.
Flow rules for hairpin queue are created on Rx, and split
by PMD to Rx and Tx rules, according to the above limitation.
In current implementation the encap action is split to Tx rule.
This patch adds the same handling for push-vlan action, as well as
its complementing actions set-vlan-vid and set-vlan-pcp.

Fixes: d85c7b5ea59f ("net/mlx5: split hairpin flows")
Cc: stable@dpdk.org
Signed-off-by: Dekel Peled <dekelp@mellanox.com>
Acked-by: Matan Azrad <matan@mellanox.com>