ppc64_cpu: Add option --threads-per-core
ppc64_cpu: Add option --threads-per-core

The threads per core calculated in ppc64_cpu is more relaiable than the
same provided by any other utility. Expose the value through an option.

Signed-off-by: Shivaprasad G Bhat <90f736271cc61454bf7410f17f3d154578105aa0@linux.vnet.ibm.com>

kamalesh-babulal/powerpc-utils,mdroth/powerpc-utils,mdroth/powerpc-utils,shenki/powerpc-utils,kamalesh-babulal/powerpc-utils,shenki/powerpc-utils,kamalesh-babulal/powerpc-utils,leitao/powerpc-ibm-utils-debian,shenki/powerpc-utils,leitao/powerpc-ibm-utils-debian,leitao/powerpc-ibm-utils-debian,mdroth/powerpc-utils