drm/i915: Use pipe config state to control gmch pfit enable/disable
Allows us to rip out a few fragile checks (which are duplicated in the hw state readout now, too). Also prepares us a bit for more than one panel/pfit. Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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