[qca-nss-ecm] Add flow and return qos tags to process result.

Replace single qos tag with flow and return qos tags.
Rework NL classifier to use flow and return qos tags.

Change-Id: I937082f6ece51423025c2474fb0de4c784edefdf
Signed-off-by: Gareth Williams <garethw@codeaurora.org>
4 files changed