drm/i915: Model PSR AUX register selection more like the normal AUX code
v2: Split up the ctl vs. data reg handling like in the normal AUX code Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/1447266856-30249-8-git-send-email-ville.syrjala@linux.intel.com
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