est update from netbsd

[Simon 'corecode' Schubert]

hey,

in my quest to make my new laptop work as a laptop is supposed to, here the first patch, importing the latest changes from netbsd's est.  it's nasty and their cpu handling code seems way cleaner...  the fsb speed detection should go somewhere else, but i don't know where.  maybe initcpu?  identcpu?

yet it seems that it is working here (although only on two frequencies, but better than nothing).  find it at <http://chlamydia.fs.ei.tum.de/~corecode/unsorted/est-update.diff>.

cheers
 simon
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