[rdkb][common][bsp][Refactor and sync wifi from openwrt]

[Description]
feda97c [MAC80211][mt76][Enable sigma daemon in mt7988]
90bafdf [MAC80211][mt76][rework patches for mt7996]
1b21440 [MAC80211][mt76][Add mac80211 5.15 source]
c75c5a6 [MAC80211][mt76][Refactor mt76 internal patches]

[Release-log]

Change-Id: I5b2706e2673bc43437f51713260237f67e8fbea9
80 files changed