snd-aoa: new apple sound driver

[Johannes Berg]

Just FYI if anyone's thinking about using this:

> GPIO stuff.

Started, you can now turn on/off the lineout/speakers/headphones (note:
powerbooks have line out, not headphones despite the symbol on them),
but automatic switching isn't done yet.
Only on new machines with PMFs though.

> Clock setting.

Done except for master/slave switching.

johannes
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