Fix warning in rnn_cell.py (#18164)
This fix fixes the warning in rnn_cell.py caused by l2_normalize with dim:
```
rnn_cell.py:2894: calling l2_normalize (from tensorflow.python.ops.nn_impl) with dim is deprecated and will be removed in a future version.
```
Signed-off-by:
Yong Tang <yong.tang.github@outlook.com>
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