drm/syncobj: Mark up the fence as an RCU protected pointer

We take advantage of that syncobj->fence is an RCU-protected pointer, and
so sparse complains that it is lacking annotation.

Cc: Dave Airlie <airlied@redhat.com>
Cc: Jason Ekstrand <jason@jlekstrand.net>
Cc: linaro-mm-sig@lists.linaro.org
Cc: linux-media@vger.kernel.org
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171102200336.23347-2-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

include/drm/drm_syncobj.h

@@ -49,7 +49,7 @@ struct drm_syncobj {
 	 * This field should not be used directly.  Use drm_syncobj_fence_get
 	 * and drm_syncobj_replace_fence instead.
 	 */
-	struct dma_fence *fence;
+	struct dma_fence __rcu *fence;
 	/**
 	 * @cb_list:
 	 * List of callbacks to call when the fence gets replaced