[][Kernel][mt7988][hnat][Add NAT66 Acceleration Support]

[Description]
Add NAT66 acceleration support.

If without this patch, NAT66 traffic cannot
enter PPE hardware path.

[Release-log]
N/A


Change-Id: I8b9250e604d3b3567ab4c5f9b86f4240dd06ec9c
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6682934
Build: srv_hbgsm110
4 files changed