net/mlx5: fix VXLAN without decap action for E-Switch

net/mlx5: fix VXLAN without decap action for E-Switch

There is an intention to support VXLAN tunnel match without
hardware offloaded decapsulation, just to redirect ingress
tunnelled frame untouched. This small fix allows to specify
Flows with VXLAN VNI pattern and with or without following
decapsulation action.

Fixes: 251e8d02cf37 ("net/mlx5: add VXLAN to flow translate routine")
Cc: stable@dpdk.org
Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
Acked-by: Shahaf Shuler <shahafs@mellanox.com>