Required for 900mhz devices to be supported due to band size.
This can also be useful for allowing more devices to fit into the same amount of RF space as nodes may often not need full 20mhz wide channels.
2.4ghz while using standard BBHN SSID is restricted to 20mhz for compatibility.
ref BBHN->ticket:50
Includes band/channel mapping
Code to set default RF channel on first boot
Add many 5ghz Ubiquiti devices in a testing phase including:
NanoBeam M5 (Intl), NanoBridge M5, AirGrid M5 HP, AirGrid M5, NanoStation M5, NanoStation Loco M5, Bullet M5, Rocket M5
see BBHN->ticket:29