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Summary:
Moves `AddNoise`, `Convolve`, `FFTConvolve`, `Speed`, `SpeedPerturbation`, `Deemphasis`, and `Preemphasis` out of `torchaudio.prototype.transforms` and into `torchaudio.transforms`.

Pull Request resolved: https://github.com/pytorch/audio/pull/3009

Reviewed By: xiaohui-zhang, mthrok

Differential Revision: D42730322

Pulled By: hwangjeff

fbshipit-source-id: 43739ac31437150d3127e51eddc0f0bba5facb15