drm/i915: initialize dpio_lock spin lock
This thing is killing lockdep. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> [Jani: move the init next to the other spin lock inits] Signed-off-by: Jani Nikula <jani.nikula@intel.com> Acked-by: Ben Widawsky <ben@bwidawsk.net> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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