Fix bug in prefill_chunk_size that ignores disable_compile flag
Author: xmarva
Pull request: yes

This PR fixes a bug in the `prefill_chunking` function where the compilation check is not performed before calling `get_compiled_call()`. 

When using `prefill_chunk_size > 0` in a `GenerationConfig`, the model's forward function is always compiled, even if `disable_compile=True` is specified. This happens because the `prefill_chunking` function directly calls `get_compiled_call()` without checking if compilation should occur:

```python
model_forward = self.get_compiled_call(generation_config.compile_config)
```

Modified to: 

```python
compile_forward = self._valid_auto_compile_criteria(model_kwargs, generation_config)
if compile_forward:
    model_forward = self.get_compiled_call(generation_config.compile_config)
```

This ensures that models aren't compiled when `disable_compile=True is set`.

Also fixed a typo in the error message ("chunkink" -> "chunking"), lol


## Before submitting
- [x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
- [x] Did you read the contributor guideline, Pull Request section?
_Yes, but this is still my first PR here, hope it's ok_
- [ ] Was this discussed/approved via a Github issue or the [forum](https://discuss.huggingface.co/)?
- [x] Did you make sure to update the documentation with your changes? 
_As far as I understand it, there's no need to change the documentation_
- [ ] Did you write any new necessary tests? 
_No, tested with a simple generation script using prefill_chunk_size=8 and disable_compile=True. Before the fix, torch.compile was being called despite disable_compile=True. After the fix, no compilation occurs as expected._


## Who can review?

@gante

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