drm/todo: Remove i915 device_link task

Done with

commit aef9f33b
Author: Imre Deak <imre.deak@intel.com>
Date:   Tue Oct 23 17:43:10 2018 +0300

    drm/i915: Ensure proper HDA suspend/resume ordering with a device link

Cc: Imre Deak <imre.deak@intel.com>
Reviewed-by: Sean Paul <sean@poorly.run>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20191022152530.22038-1-daniel.vetter@ffwll.ch

Documentation/gpu/todo.rst

@@ -438,13 +438,6 @@ See drivers/gpu/drm/amd/display/TODO for tasks.
 
 Contact: Harry Wentland, Alex Deucher
 
-i915
-----
-
-- Our early/late pm callbacks could be removed in favour of using
-  device_link_add to model the dependency between i915 and snd_had. See
-  https://dri.freedesktop.org/docs/drm/driver-api/device_link.html
-
 Bootsplash
 ==========