[][MAC80211][mt76][rework patches for mt7996]

[Description]
Refactor patches of mt7996 autobuild on top of mt76 master.

[Release-log]
N/A

Change-Id: If9caf30404c61e4f294e2f3ebe6325659ed35384
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7097840
16 files changed