net/mlx5: support meter hierarchy drop count

net/mlx5: support meter hierarchy drop count

When using meter hierarchy with multiple meters, every meter may have
drop counter, so a packet being set red color by one meter should be
counted to that specific meter only.

To support this, add tag action in the color rule so packet going to
next new meter can have its meter id, so as to be counted to the
correct drop counter in drop table.

Signed-off-by: Shun Hao <shunh@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>