drm/i915: Change DCC tiling detection case to cover only mobile parts.
Later spec investigation has revealed that every 9xx mobile part has
had this register in this format. Also, no non-mobile parts have been shown
to have this register. So make all mobile use the same code, and all
non-mobile use the hack 965 detection.
Signed-off-by: Eric Anholt <eric@anholt.net>
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