Asus ac88u (scavenged from Asus RT-AC88U only 1 device per radio can be enabled ) - brcmfmac survey kills multi-ap-ness
valid interface combinations:
* #{ managed } <= 1, #{ P2P-device } <= 1, #{ P2P-client, P2P-GO } <= 1,
total <= 3, #channels <= 1
* #{ managed } <= 1, #{ AP } <= 1, #{ P2P-client } <= 1, #{ P2P-device } <= 1,
total <= 4, #channels <= 1
* #{ AP } <= 4,
total <= 4, #channels <= 1, STA/AP BI must match