You're talking about low-power hardware designed for mobile devices. With no proper cooling whatsoever (because it doesn't really need it since it's, well, low-power). You want as much power as possible for mining purposes, a single high-end graphics card for PC will be like 100+ times more powerful than any of those chips for mobile devices you mentioned. They just don't make sense to mine with, they're designed (and better suited) for other purposes.