drm/vmwgfx: stop using dma_resv_excl_fence v2

Instead use the new dma_resv_get_singleton function.

v2: drop the TODO comment.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Zack Rusin <zackr@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220321135856.1331-7-christian.koenig@amd.com

drivers/gpu/drm/vmwgfx/vmwgfx_resource.c

@@ -1163,8 +1163,9 @@ int vmw_resources_clean(struct vmw_buffer_object *vbo, pgoff_t start,
 		vmw_bo_fence_single(bo, NULL);
 		if (bo->moving)
 			dma_fence_put(bo->moving);
-		bo->moving = dma_fence_get
-			(dma_resv_excl_fence(bo->base.resv));
+
+		return dma_resv_get_singleton(bo->base.resv, false,
+					      &bo->moving);
 	}
 
 	return 0;