[Wav2Vec2] Slow pretraining tests are failing on CPU
The following tests are failing on CPU currently: 

```
tests/test_modeling_wav2vec2.py::Wav2Vec2ModelIntegrationTest::test_inference_integration
tests/test_modeling_wav2vec2.py::Wav2Vec2ModelIntegrationTest::test_loss_pretraining
```

-> check if they also fail on GPU. If not add a skip CPU decorator
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/master/CONTRIBUTING.md) are likely to be ignored.