ppc64_cpu: Let kernel validate subcore options
ppc64_cpu: Let kernel validate subcore options

Previously we checked for valid subcore-per-core options, however, the
kernel knows better than we do as to what is valid. Remove the check.

Signed-off-by: Joel Stanley <4816dabf8db1bc6cac35b3a24cab2ff844b5b0c7@jms.id.au>

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