First revision of the Xbox One has both chipsets on the same PCB, a 8-pin connection goes from the PCB to the motherboard.
Xbox One (PHAT)
Xbox One S
Xbox One X (SCORPIO)
On the conference ZeroNights 2018 several vulnerabilities in the Marvell Avastar Wifi chip family (88W8787, 88W8797, 88W8801, 88W8897, and 88W8997) were presented. Click here for more info: Link