[RFC] Patch to enable temperature ceiling in powerd

[Alexandre "Sunny" Kovalenko]

Some time ago I have put together patch for powerd, which allows user to
specify the temperature threshold at which powerd will lower CPU
frequency no matter what the load was at the time. I recently had to
adapt it to the 7.0-PRERELEASE for someone with the overheating laptop,
which got me to think that it might be useful for someone else yet.

Basic idea is fairly simple -- check temperature in TZ0 and, if it has
reached certain value, either override frequency with the lowest
available (in the case of 'max' setting) or change idle time to 100% and
let adaptive algorithm decrease frequency gradually.

I imagine it also could be poor man's substitute for the low noise
acoustic policy ;)

If there is an interest, I will go ahead and submit a PR, otherwise it
will live in the mail archives for someone to find. Any comments,
suggestions or criticisms are welcome.

Temperature threshold (in Celsius) could be set by means of '-T' command
line option (as in '-T 60').

-- 
Alexandre "Sunny" Kovalenko (Олександр Коваленко)
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