drm/i915: don't save/restore DSPARB on gen5+
Because the register does not exist in gen5+. This patch solves "unclaimed register" messages on Haswell after suspend/resume. Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com> Reviewed-by: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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