drm/i915: change power_well->lock to be mutex
There is no hard need for this to be a spin lock, as we don't take these locks in irq context from anywhere. An upcoming patch will add calls to punit read/write functions from within regions protected by this lock and those functions need a mutex in turn. As a solution for that convert the spin lock to be a mutex. Signed-off-by: NImre Deak <imre.deak@intel.com> Reviewed-by: NJesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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