HP9000/425e arcofi(4) audio driver

I wrote:

> Recently Miod Vallat kindly sent his HP9000/425e to me after
> OpenBSD/hp300 EOL, and then I've been working on 425e device support
> of NetBSD/hp300.

This weekend I've ported OpenBSD's arcofi(4) audio driver for the
HP "Audio1" device (Siemens PSB 2160 "ARCOFI" phone quality audio chip)
found on HP 9000/425e.

Patch to be committed is here:
 https://gist.github.com/tsutsui/f1dec4c1a6dbf0417a4b

Dumb demonstration video is also available on YouTube:
 http://www.youtube.com/watch?v=uR1yOay8YE0

I have not checked hppa attachment (it should be trivial),
but anyway I'll commit this driver soon and will send
a pullup request for forthcoming NetBSD 7.0.

Have fun,
---
Izumi Tsutsui