drm/i915: fix i915_interrupt_info on BDW
Currently, if the machine is runtime suspended an you read the file, you will get an "Unclaimed register" error message. Testcase: igt/pm_rpm/debugfs-read Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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