I don't recall ever seeing Apple use an Intel solution for wifi, only Broadcom and Atheros. These are the only plugin kexts I see inside IO80211Family.kext:

AirPortBrcm4360.kext

AirPortBrcm4331.kext

AppleAirPortBrcm43224.kext

AirPortAtheros40.kext

They each support multiple chipsets so the kext names that appear so specific are a little misleading, but it's still just those 2 companies apparently.