Honestly, the customer doesn't care if the chip supports it. The out-of-the-box experience of´the vast majority of mobile phones (excluding Lumia and some dumb phones – I forgot those) is simply: no FM radio.
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Actually, the vast majority of mobile phones do have built-in FM. That might not be true in the US, but it is certainly true of the the vast majority of mobile phones worldwide.
More likely: most US mobile phones not made by Apple also have FM, but the carriers block it. Hence http://www.npr.org/blogs/alltechconsidered/2015/04/16/400178...
Android user here (with a carrier phone). It has FM radio. As does every one I've ever seen. It's so basic that it's a widget for the homescreen rather than an app. This may be why you missed it...