get default device through `PartialState().default_device` as it has been officially released
Author: ji-huazhong
Pull request: yes

# What does this PR do?
As per title.

The main branch is now at 4.38.dev0, so I submit this PR which is a continuation of (the merged) https://github.com/huggingface/transformers/pull/26774.


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Comments:
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_27256). All of your documentation changes will be reflected on that endpoint.

@muellerzr If we've had a deprecation notice for a few releases and it's available from the lowest version of accelerate officially supported in setup.py then I think we're fine. 

However, @statelesshz I can see that in this PR: https://github.com/huggingface/transformers/pull/26774/files that the deprecation notice mentions that it will be removed in v4.36 but this warning should still be present in v.4.35 (current release). This is entirely my bad - I shouldn't have approved and merged the PR. 

As such, we'll need to do a version check like @muellerzr suggests, add back the warning from #26774, updating the notice to v4.37 and then remove it all in v4.37. Sorry for not catching this. 

> @muellerzr If we've had a deprecation notice for a few releases and it's available from the lowest version of accelerate officially supported in setup.py then I think we're fine.
> 
> However, @statelesshz I can see that in this PR: https://github.com/huggingface/transformers/pull/26774/files that the deprecation notice mentions that it will be removed in v4.36 but this warning should still be present in v.4.35 (current release). This is entirely my bad - I shouldn't have approved and merged the PR.
> 
> As such, we'll need to do a version check like @muellerzr suggests, add back the warning from #26774, updating the notice to v4.37 and then remove it all in v4.37. Sorry for not catching this.

This sounds reasonable :)

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.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md) are likely to be ignored.

cc @statelesshz, can you do it for v4.38 instead? Thanks! (A new release is coming this week)

I'd like to open another PR to update the notice to v4.38 and leave this PR open until it's OK to be merged :-) WDYT @muellerzr 

Works with me @statelesshz!

@muellerzr do you want to merge this? 

@amyeroberts The main branch is now at 4.38.dev0, I think this PR is ready to be merged :-)