[][kernel][mt7988][hnat][Update PPPQ and HQOS coexistense feature]

[Description]
Refactor PPPQ and HQOS coexistense feature.

In our design, users are allowed to assign specific session into HQoS
TXQ using iptables/ebtables mark under PPPQ mode.
However, we have found that this feature is not working in NETSYS_V3.

Without this patch, the users are unable to assign TXQ using the
skb mark under PPPQ mode in NETSYS_V3.

[Release-log]
N/A


Change-Id: I770c52a8a00329e782f48f50b6c7797eb5ada458
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8203892
2 files changed