Without this the new drv_suspend/forcewake subtest I've created
doesn't result in immediately visible failures.
Cc: Mika Kuoppala <mika.kuoppala@intel.com> Cc: Ben Widawsky <ben@bwidawsk.net> Cc: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>