drm/i915: Clear pfit registers when not used by any outputs
... otherwise the panel-fitter may be left enabled with random settings and cause unintended filtering (i.e. blurring of native modes on external panels). Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=31942Reported-and-tested-by: NBen Kohler <bkohler@gmail.com> Tested-by: NCiprian Docan <docan@eden.rutgers.edu> Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
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