drm/i915: clarify preferred sdvo input mode code
- kill intel_sdvo->input_dtd, it's only used as a temporary variable,
we store the preferred input mode in the adjusted mode at mode_fixup
time.
- rename the function to make it clear what we want it to do (get the
preferred mode) and say in a comment what it unfortunately does as a
side-effect (set the new output timings).
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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