ppc64_cpu: output only the number of SMT threads when smt is on
ppc64_cpu: output only the number of SMT threads when smt is on

This patch removes "SMT is on" as a possible output when the smt option
is used. Instead, only the number of SMT threads will be displayed.

Signed-off-by: Thomas Falcon <3be58c5f4f5b8a6fb702b2062dd3fbac29655c50@linux.vnet.ibm.com>

mdroth/powerpc-utils,kamalesh-babulal/powerpc-utils,shenki/powerpc-utils,shenki/powerpc-utils,kamalesh-babulal/powerpc-utils,shenki/powerpc-utils,mdroth/powerpc-utils,mdroth/powerpc-utils,kamalesh-babulal/powerpc-utils