Andrew Turner 9ca3eaf0bd Add a GPIO driver for the Raspberry Pi firmware GPIOs
These exist on the Raspberry Pi 3 and 4 and control and external IO
expander.

Reviewed by:	manu
Sponsored by:	Innovate UK
Differential Revision:	https://reviews.freebsd.org/D25858
2020-08-03 17:18:12 +00:00
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