drm/amdgpu: Don't set struct drm_driver.output_poll_changed

Don't set struct drm_driver.output_poll_changed. It's used to restore
the fbdev console. But as amdgpu uses generic fbdev emulation, the
console is being restored by the DRM client helpers already. See the
functions drm_kms_helper_hotplug_event() and
drm_kms_helper_connector_hotplug_event() in drm_probe_helper.c.

v2:
	* fix commit description (Christian)
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221103151446.2638-5-tzimmermann@suse.de

drivers/gpu/drm/amd/amdgpu/amdgpu_display.c

@@ -1214,7 +1214,6 @@ amdgpu_display_user_framebuffer_create(struct drm_device *dev,
 
 const struct drm_mode_config_funcs amdgpu_mode_funcs = {
 	.fb_create = amdgpu_display_user_framebuffer_create,
-	.output_poll_changed = drm_fb_helper_output_poll_changed,
 };
 
 static const struct drm_prop_enum_list amdgpu_underscan_enum_list[] =

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -82,7 +82,6 @@
 #include <drm/drm_atomic_uapi.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_blend.h>
-#include <drm/drm_fb_helper.h>
 #include <drm/drm_fourcc.h>
 #include <drm/drm_edid.h>
 #include <drm/drm_vblank.h>
@@ -2810,7 +2809,6 @@ const struct amdgpu_ip_block_version dm_ip_block =
 static const struct drm_mode_config_funcs amdgpu_dm_mode_funcs = {
 	.fb_create = amdgpu_display_user_framebuffer_create,
 	.get_format_info = amd_get_format_info,
-	.output_poll_changed = drm_fb_helper_output_poll_changed,
 	.atomic_check = amdgpu_dm_atomic_check,
 	.atomic_commit = drm_atomic_helper_commit,
 };