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

[Description]
d5ae826 [MAC80211][mt76][Fix AP crash when a station connects to AP]
5ba8783 [MAC80211][misc][Add MT7996 external openwrt build]
9e48559 [MAC80211][mt76][move muru_onoff in mt7915_phy]
1477805 [mac80211][mt76][wifi: mt76: update tx statistics]

[Release-log]

Change-Id: I93284df17ea450cba0339fa97e46dd00c40f4d9b
22 files changed