Remove placeholders patch in src/transformers/utils/fx.py
Author: pbelevich
Pull request: yes

# What does this PR do?
This PR removes a patch that is not necessary anymore(since https://github.com/pytorch/pytorch/pull/59569 was merged long time ago)

cc: @michaelbenayoun 

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Fixes # (issue)


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Comments:
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_17129). All of your documentation changes will be reflected on that endpoint.

When it this out, I get this for BERT:

```
E         File "<eval_with_key>.1", line 4                                                                                                                                                    
E       SyntaxError: non-default argument follows default argument                                                                                                                            
                                                                                                                                                                                              
../../miniconda3/envs/transformers/lib/python3.7/site-packages/torch/fx/graph_module.py:71: SyntaxError
```

Do you have any idea how this can be fixed?