Revert "[CPUFREQ] powernow-k8: clarify number of cores."

This reverts commit 904f7a3f.

As noted by Peter Anvin:

  "It causes build failures on i386.

   Yet another case of unnecessary divergence between i386 and x86-64
   I'm afraid..."

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>