[coreboot] libpayload TSC dependency

[bifferos]

The attached patch is sufficient to make coreinfo run on a machine
without TSC, however while trying to get FILO to run I've realised
this involves more changes than I originally expected. 

cpu_khz gets exposed as a global, so it's going to be very difficult 
to support CPUs without TSC, without changing the mechanisms some
payloads use to do timing.  If you don't have TSC, then cpu_khz is
largely irrelevant, but FILO accesses it directly.

I think this global needs to be removed and some other mechanism 
introduced for handling timeouts.

regards,
Biff.



      
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