drm/i915: Add overlooked plane disable tracepoint into intel_crtc_disable_planes()

intel_crtc_disable_planes() disables the planes so it should
trigger the appropriate tracepoint.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190206204910.13965-3-ville.syrjala@linux.intel.comReviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/i915/intel_display.c

@@ -5589,6 +5589,7 @@ static void intel_crtc_disable_planes(struct intel_atomic_state *state,
 		    !(update_mask & BIT(plane->id)))
 			continue;
 
+		trace_intel_disable_plane(&plane->base, crtc);
 		plane->disable_plane(plane, new_crtc_state);
 
 		if (old_plane_state->base.visible)