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Summary:
Removing LTS mention and packages from README as it is discontinued.

Pull Request resolved: https://github.com/pytorch/audio/pull/2844

Reviewed By: hwangjeff, xiaohui-zhang

Differential Revision: D41200886

Pulled By: mthrok

fbshipit-source-id: 0da0afe68df51826075ce945cf0cf1de901e1c8f