Revert DeepSpeed stuff
# What does this PR do?

During the integration some deepspeed items that need further looks into before it can be part of the integration need to be addressed/looked at more carefully. This PR reverts the base deepspeed logic done in `setup_devices` and `parallel_mode` to restore the original deepspeed behavior

Fixes # (issue)


## Before submitting
- [ ] 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](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md#start-contributing-pull-requests),
      Pull Request section?
- [ ] Was this discussed/approved via a Github issue or the [forum](https://discuss.huggingface.co/)? Please add a link
      to it if that's the case.
- [ ] Did you make sure to update the documentation with your changes? Here are the
      [documentation guidelines](https://github.com/huggingface/transformers/tree/main/docs), and
      [here are tips on formatting docstrings](https://github.com/huggingface/transformers/tree/main/docs#writing-source-documentation).
- [ ] Did you write any new necessary tests?


## Who can review?

Anyone in the community is free to review the PR once the tests have passed. Feel free to tag
members/contributors who may be interested in your PR.

@sgugger, cc @pacman100 so you're aware. 
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_22899). All of your documentation changes will be reflected on that endpoint.<|||||>I see this was included in transformers 4.29.0 (https://github.com/huggingface/transformers/releases/tag/v4.29.0). Could you share more about how this changes the Transformers + DeepSpeed integration? I don't quite understand the diff. Does this disable some deeper level of integration of DS with Transformers?<|||||>@jli this pr just reverted a small portion of Accelerate handling the deepspeed part when we weren't ready for that yet. CC @pacman100 if you could explain accelerates deepspeed integration vs the transformers one were replacing in terms of features? :)