AMD designs are used as a part of the design, and AMD has shown x86 and ARM chips which fit in the same sockets
Finally, we’ll note that this roadmap is empty of any mentions of project Skybridge. CEO Lisa Su has commented that AMD has decided to change their focus away from Skybridge based on customer feedback. Customers were telling AMD that they didn't necessarily need socket compatible solutions, so AMD is going to work on differentiated solutions. That said, given that Skybridge was announced last year and planned for 20nm, I suspect that it has also become a victim of the short lifespan (and underperforming nature) of 20nm, leading to it being downplayed in favor of 14nm prodcts.
Again, I'm far from an expert but it seems like a simple enough solution.
The hard part is wrangling the software: BIOS, drivers, testing and more testing, patches, microcode updates. Finding out that your wifi chip vendor has moved the chip to end-of-life just before you were ready to ship would be a non-issue if the software part were faster.