Fix `PvtModelIntegrationTest::test_inference_fp16`
# What does this PR do?

Failing

```bash
FAILED tests/models/pvt/test_modeling_pvt.py::PvtModelIntegrationTest::test_inference_fp16 - ValueError: PvtForImageClassification does not support `device_map='auto'`. To implement support, the modelclass needs to implement the `_no_split_modules` attribute.
```

A fix for this test will fix the other 2 shown in the report (due to bad GPU state or something else)
_The documentation is not available anymore as the PR was closed or merged._