drm/i915: Avoid reading fbc registers in vain when fbc was never enabled.
If it wasn't never enabled by kernel parameter or platform default we can avoid reading registers so many times in vain Cc: Paulo Zanoni <paulo.r.zanoni@intel.com> Signed-off-by: NRodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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