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

- add R535 implementation of VFN, minus interrupt table

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230918202149.4343-23-skeggsb@gmail.com

drm/nouveau/vfn/tu102-: support new-style interrupt tree

- switches ampere over now, and removes its hack mc implementation

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

drm/nouveau/vfn: move NV_USERMODE class from host

- uses proper class IDs for Turing/Ampere

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

drm/nouveau/vfn: add stub subdev for dev_func

Initially for NV_USERMODE class, and Turing/Ampere's new interrupt tree.

v2. fixup for ga103 early merge

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>