drm/i915/display/atomic_plane: Prefer drm_WARN_ON over WARN_ON

struct drm_device specific drm_WARN* macros include device information
in the backtrace, so we know what device the warnings originate from.

Prefer drm_WARN_ON over WARN_ON.
Signed-off-by: Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200406112800.23762-3-pankaj.laxminarayan.bharadiya@intel.com

drivers/gpu/drm/i915/display/intel_atomic_plane.c

@@ -125,7 +125,7 @@ intel_plane_destroy_state(struct drm_plane *plane,
 			  struct drm_plane_state *state)
 {
 	struct intel_plane_state *plane_state = to_intel_plane_state(state);
-	WARN_ON(plane_state->vma);
+	drm_WARN_ON(plane->dev, plane_state->vma);
 
 	__drm_atomic_helper_plane_destroy_state(&plane_state->uapi);
 	if (plane_state->hw.fb)
@@ -396,7 +396,7 @@ skl_next_plane_to_commit(struct intel_atomic_state *state,
 	}
 
 	/* should never happen */
-	WARN_ON(1);
+	drm_WARN_ON(state->base.dev, 1);
 
 	return NULL;
 }