[coreboot] try again

[ron minnich]

 what was I thinking with that earlier patch? Don't do things when so
distracted. Now I have to run and do some things.

Rename log2 to log2c (ceiling) and add log2f (floor). People need to
be aware of what they are doing with log2, it is easy to make a
mistake.

This is a proposal, as it will break a (very) few things, the rewrite
is trivial, pick the right log2 function, but I got bit by the fact
that log2 as written has assumptions that don't meet all needs.

ron
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