[][MAC80211][misc][Add mt7988+mt7996 build]

[Description]
Add mt7988+mt7996 build

[Release-log]
N/A

Change-Id: Idcc32bff51cfcfdd2243002fd767ee869cb05834
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6675823
Build: srv_hbgsm110
220 files changed