`torch.accelerator.is_available()` fails when privateuseone is used
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module: accelerator
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- Python
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Description
### 🐛 Describe the bug
Run `PYTORCH_TEST_WITH_DYNAMO=1 python test/test_rename_privateuse1_to_existing_device.py TestRenamePrivateuseoneToExistingBackend.test_external_module_register_with_existing_backend`
on 3733909afd07af889a9a245d0315853d17203da2
I skipped the test for now, since it's only exposed when dynamo interprets it.
https://gist.github.com/mlazos/50954c6c956e313d9a70fe9584f801b7
### Versions
3733909afd07af889a9a245d0315853d17203da2
cc @albanD @guangyey @EikanWang
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