gpio-async: convert to ywf #547
                
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Compile-tested only, fairly straight conversion.
There's a mild deviation from the style guide with the
wait_for_generic_commandinstead of 6 differentwait_for_[set|clear|...]methods. It mirrors how the driver itself is implemented, and I think is a cleaner design and easier to follow than lots of redundant syscall methods.More generally, I suspect as we port more of these we may find it makes sense to rethink the guidance around ywf methods, but I'm not a that level of confident with just this one.