drm/todo: Update backlight todo

Basic helpers have been extracted, now there's a pile more todo still
across the entire tree.

Reviewed-by: Daniel Thompson <[email protected]>
Acked-by: Sam Ravnborg <[email protected]>
Reviewed-by: Emil Velikov <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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