drm/nouveau/therm/tu102-: prepare for GSP-RM

- disable THERM completely when GSP-RM detected

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230918202149.4343-21-skeggsb@gmail.com