nearly-working support for cpufreq on 2004 iBook G4 with 7447Acpu

[John Steele Scott]

> Oh, and when switching to high speed, think about tweaking the
> voltage too. I don't know if it's high or low when setting the
> GPIO bit, you may want to check out OF code, it certainly have
> methods for that. Or you can read the voltage value back from
> the adt themometer chip I think, as it does voltage control.

I will double-check this tonight (am at uni now), but I thought that the
core voltage for this chip does not change with frequency . . . :(

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