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Summary:
The PR https://github.com/pytorch/audio/issues/3549 re-organized the backend implementations and deprecated the direct access to torchaudio.backend.

The change was supposed to be BC-compatible while issuing a warning to users, but the implementation of module-level `__getattr__` was not quite right.

See an issue https://github.com/pyannote/pyannote-audio/pull/1456.

This commit fixes it so that the following imports work;

```python
from torchaudio.backend.common import AudioMetaData

from torchaudio.backend import sox_io_backend
from torchaudio.backend.sox_io_backend import save, load, info

from torchaudio.backend import no_backend
from torchaudio.backend.no_backend import save, load, info

from torchaudio.backend import soundfile_backend
from torchaudio.backend.soundfile_backend import save, load, info
```

Pull Request resolved: https://github.com/pytorch/audio/pull/3595

Reviewed By: nateanl

Differential Revision: D48957446

Pulled By: mthrok

fbshipit-source-id: ebb256461dd3032025fd27d0455ce980888f7778