drm/nouveau/pm/nv40: rename pcounter domains to 'pc' instead of 'pm'
drm/nouveau/pm/nv40: rename pcounter domains to 'pc' instead of 'pm'

This trivial patch makes thing more consistent since hardware signals
names are prefixed by 'pcXX'.

Signed-off-by: Samuel Pitoiset <506e97eed81d9e59d22f4c73fb51123bb62b4a30@gmail.com>
Signed-off-by: Ben Skeggs <d9f27fb07c1e9f131223ad827fa5179f3846c30b@redhat.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs