A recent change removed create_run_config's shard_to_cpu argument, so remove that in t2t_attack.py
A recent change removed create_run_config's shard_to_cpu argument, so remove that in t2t_attack.py

PiperOrigin-RevId: 219408899

tensorflow/tensor2tensor,tensorflow/tensor2tensor,tensorflow/tensor2tensor,tensorflow/tensor2tensor,tensorflow/tensor2tensor