[CFT] gpio.4

[Sean Bruno]

http://people.freebsd.org/~sbruno/gpio.4.txt

More or less, this is a braindump of what I learned when mucking around
with the Atheros 24k mips hardware.  PLEASE review this as I've found a
bunch of *other* GPIO interfaces strewn about the code and tried to
document what I found.  I *only* went into detail on the hints and
interfaces that I've directly been playing with, but I documented the
existence of other GPIO interfaces on ARM/MIPS/POWERPC

I don't think its fair to ask people to learn this *every* time when
reading the code.  :-)

Thanks to gjb and adrian for some initial review, comments and feedback.

Sean
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