Quoting Pascal Terjan (2020-05-10 22:25:21)
> It has been unused since commit ccb2aceaaa5f ("drm/i915: use vfuncs for
> reg_read/write_fw_domains").
>
> Signed-off-by: Pascal Terjan <pterjan at google.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris