drm/nouveau: Do not set struct drm_mode_config_funcs.output_poll_changed

The output_poll_changed hook was only necessary before in-kernel
DRM clients existed, but is now obsolete. The client code handles
display hotplugging internally.

v2:
- fix commit description
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240812083000.337744-5-tzimmermann@suse.de

drivers/gpu/drm/nouveau/dispnv50/disp.c

@@ -2648,7 +2648,6 @@ nv50_disp_atomic_state_alloc(struct drm_device *dev)
 static const struct drm_mode_config_funcs
 nv50_disp_func = {
 	.fb_create = nouveau_user_framebuffer_create,
-	.output_poll_changed = drm_fb_helper_output_poll_changed,
 	.atomic_check = nv50_disp_atomic_check,
 	.atomic_commit = nv50_disp_atomic_commit,
 	.atomic_state_alloc = nv50_disp_atomic_state_alloc,

drivers/gpu/drm/nouveau/nouveau_display.c

@@ -391,7 +391,6 @@ nouveau_user_framebuffer_create(struct drm_device *dev,
 
 static const struct drm_mode_config_funcs nouveau_mode_config_funcs = {
 	.fb_create = nouveau_user_framebuffer_create,
-	.output_poll_changed = drm_fb_helper_output_poll_changed,
 };