drm/atomic-helper: Update reference to drm_crtc_force_disable_all()

drm_crtc_force_disable_all() was renamed to
drm_helper_force_disable_all(), but one reference was not updated.

Fixes: c2d88e06 ("drm: Move the legacy kms disable_all helper to crtc helpers")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Sui Jingfeng <suijingfeng@loongson.cn>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/b8c9c1a8a05dbf0be8e8be98cfdeafa9cecd8cef.1690535002.git.geert+renesas@glider.be

drivers/gpu/drm/drm_atomic_helper.c

@@ -3332,7 +3332,7 @@ EXPORT_SYMBOL(drm_atomic_helper_disable_all);
  * that also takes a snapshot of the modeset state to be restored on resume.
  *
  * This is just a convenience wrapper around drm_atomic_helper_disable_all(),
- * and it is the atomic version of drm_crtc_force_disable_all().
+ * and it is the atomic version of drm_helper_force_disable_all().
  */
 void drm_atomic_helper_shutdown(struct drm_device *dev)
 {