Don't touch any hardware registers while fetching hw.cpuspeed and

just return current pentium_mhz value. Update this value in
all hw.setperf hoos either via its own private methods or using
global update_cpuspeed hook, if registered.
Also implement update_cpuspeed hook for Pentium 3.

Tested by millert@, Gabriel Kihlman <gk@stacken.kth.se> and me on
various i386 machines.

ok tedu@

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