drm/i915/bxt: Add the plane4 related interrupt definitions

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Antti Koskipää <antti.koskipaa@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
1 file changed