net/mlx5: fix meter flow direction check

net/mlx5: fix meter flow direction check

When preparing prefix flow using ASO meter, if it's tx flow, need
to make meter action the first one.

Currently the check of flow direction in switch domain is incorrect
that it checks the flow dev port only.

This adds the fix for the check that if there's port_id match item
in flow, use that port_id as src port to determine flow direction.

Fixes: c99b4f8bc2f1 ("net/mlx5: support ASO meter action")
Cc: stable@dpdk.org
Signed-off-by: Shun Hao <shunh@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>