drm/nouveau/disp: release outputs post-modeset

Prior to this commit, KMS would call release() prior to modeset, and the
second supervisor interrupt would update SOR routing if needed.

Now, KMS will call release() post-modeset and update routing immediately.

- preparation for GSP-RM

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-22-lyude@redhat.com