message: Mark custom layer norm as deprecated.
diff: @@ -13,6 +13,10 @@ See the License for the specific language governing permissions and
  limitations under the License.
  ==============================================================================*/
  +// DEPRECATED: Tensorflow Lite has implemented layer norm lstm as builtin Op and
  +// the implementation of layer norm lstm as custom Op in this file is
  +// deprecated. It is only kept for backward compatibility.
  +//
  // Layer Normalization LSTM op that applies normalization by mean and standard
  // deviation to the activation of the LSTM layers. Please see
  // https://arxiv.org/abs/1607.06450 for details.
  