drm/i915: Add .atomic_{get, set}_property() entrypoints to planes

When we flip on the DRIVER_ATOMIC bit, the DRM core will start calling
this entrypoint to set and lookup driver-specific plane property values,
rather than maintaining a shadow copy in object->properties.

Note that although we add these functions to the plane vtable, they will
not yet be called.  Future patches that switch our .set_property()
handler and/or enable full atomic functionality are required before
these code paths will be executed.

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Ander Conselvan de Oliveira <conselvan2@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index ce71fc5..0cdcf9b 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -12054,6 +12054,8 @@
 	.disable_plane = drm_plane_helper_disable,
 	.destroy = intel_plane_destroy,
 	.set_property = intel_plane_set_property,
+	.atomic_get_property = intel_plane_atomic_get_property,
+	.atomic_set_property = intel_plane_atomic_set_property,
 	.atomic_duplicate_state = intel_plane_duplicate_state,
 	.atomic_destroy_state = intel_plane_destroy_state,