drm/nouveau/nvenc/r535: initial support

Adds support for allocating VIDEO_ENCODER classes from RM.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230918202149.4343-43-skeggsb@gmail.com

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

- (temporarily) disable if GSP-RM detected, will be added later
- provide empty class list for non-GSP paths
- split tu102 from gm107, it will provide host classes later

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230918202149.4343-29-skeggsb@gmail.com