net/mlx5: fix mirroring with metering action

net/mlx5: fix mirroring with metering action

While there's mirror action prior to the meter action in the E-Switch
flow, means that the packets should be duplicated into port firstly,
and then do meter and send to the original destination.
MLX5 PMD will split the above E-Switch flow into two sub flows,
similar as mirror with modify action before.

Fixes: 07627fbf1506 ("net/mlx5: support E-Switch mirroring with modify action")
Cc: stable@dpdk.org
Signed-off-by: Jiawei Wang <jiaweiw@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>