CFT (and comments, changes, etc): G4 Windtunnel fan driver

[Justin Hibbits]

Attached is a driver for the G4 MDD (windtunnel) fan controller.  It  
seems to work for me, but it does make certain assumptions that may  
make it non-portable:

- It assumes that the sensor device is already attached when it starts  
the management kproc (it should be attached, it's not started until  
interrupts are enabled, so all devices should have been scanned by  
then).

I gutted it from Andreas Tobler's FCU driver, so some comments may not  
be completely correct.  It probably also violates style(9) in several  
places, which I can address later.

To compile, you need the following: apply the enclosed patch, put the  
driver in ...sys/powerpc/powermac/windtunnel.c, and add 'device  
windtunnel' to your kernel config.

- Justin
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