acpi: update stale comments about order of cpu devices probing
acpi: update stale comments about order of cpu devices probing

These comments should have been updated in r203776 when the order was
changed.

Pointyhat to:	avg
MFC after:	3 days

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase