drm/i915: Always pass dev pointer in pdp_init

And fix 0-DAY kernel test infrastructure warning.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Michel Thierry <michel.thierry@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>