Do not use channel_layout in StreamReader

[mthrok]

We only care about the number of channels, so no need to create channel_layout.

One can directly pass the number of channels to filter.

Also int64 channel_layout is a deprecated attributes.

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[pytorch-bot]

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• Integration Test / build (3.8) (gh)
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• Unit-tests on Linux CPU / tests (3.10) / linux-job (gh)
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• Unit-tests on Linux CPU / tests (3.8) / linux-job (gh)
  ##[error]The operation was canceled.
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• Unittests on Windows CPU / unittests-windows-cpu / windows-job (gh)
  torchaudio_unittest\io\stream_writer_test.py::StreamWriterCorrectnessTest::test_filter_graph_audio
• Unittests on Windows GPU / unittests-windows-gpu / windows-job (gh)
  torchaudio_unittest\io\stream_writer_test.py::StreamWriterCorrectnessTest::test_filter_graph_audio

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