drm/i915: move all rps state into dev_priv->rps
This way it's easier so see what belongs together, and what is used by the ilk ips code. Also add some comments that explain the locking. Note that (cur|min|max)_delay need to be duplicated, because they're also used by the ips code. v2: Missed one place that the dev_priv->ips change caught ... Reviewed-by: NBen Widawsky <ben@bwidawsk.net> Reviewed-by: NDamien Lespiau <damien.lespiau@intel.com> Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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