drm/i915: protect RPS/RC6 related accesses (including PCU) with a new mutex
This allows the power related code to run independently of the rest of the pipeline, extending the resume and init time improvements into userspace, which would otherwise have been blocked on the struct mutex if we were doing PCU communication. v2: Also convert the locking for the rps sysfs interface. Suggested-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> (v1) Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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