2933 compiler warning gags need better granularity
Reviewed by: Eric Schrock <eric.schrock@delphix.com>
Approved by: Garrett D'Amore <garrett@damore.org>

FWARC/2006/498 N2 PIU Performance Counters HV API
FWARC/2006/592 Niagara2 PIU Performance Counter bus binding and MD description
6466249 Need support for N2 PIU performance counters