clocksource update v12

This tree is mostly cleanups . I move timekeeping code into it's own 
file, and I modify the clocksource interface to provide a more robust
API.

I've dropped some duplication off the hrt/dynamic tick patch set which
is all new to that tree and new to -mm. This is an -mm patch set , it's
not meant to go on 2.6.20-rc6 at all .. I'm modifying code only
included in -mm.

I boot tested x86_64 smp, and i386 smp, and compile tested for ARM
(!GENERIC_TIME). This set should be bisect-able for at least i386 and
likely x86_64.

It's also available at,

ftp://source.mvista.com/pub/dwalker/clocksource/clocksour...

Daniel
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