fix dynamic_module import err
Author: Fazziekey
Pull request: yes

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<!-- Remove if not applicable -->
 Fix the dynamic module import err for #28459, 
when user use custom model by `transformers.AutoModelForCausalLM.from_pretrained(model_name_or_path, trust_remote_code=True)`, for example [Phi](https://huggingface.co/microsoft/phi-1_5/discussions/72), [DeepSeekMOE](https://huggingface.co/deepseek-ai/deepseek-moe-16b-base), will get error 
```
ImportError: This modeling file requires the following packages that were not found in your environment: flash_attn. Run `pip install flash_attn`
python-BaseException
```
Which caused by import flash attention, however, some device for example Mac, don't support CUDA, but can run model on CPU, user will be blocked by this problem. I think it should be a warning rather than error.

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Comments:
@ArthurZucker 

> Hey! I think that is not too bad. IMO we should rather check if the imports are protected or not / have a list of packages that can be ignored because this will no longer warn users for every other packages that might be missing :(

TheThe Ci is failed, I don't know why tf model will be failed
![image](https://github.com/huggingface/transformers/assets/55798671/c04c0356-2a31-4602-af7e-156300a06acf)


> Hey! I think that is not too bad. IMO we should rather check if the imports are protected or not / have a list of packages that can be ignored because this will no longer warn users for every other packages that might be mssing :(

That‘s right, not all module is necessary

This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

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