Add support for multiple playback and recording devices per physical USB audio device. This requires some structural refactoring inside the driver, mostly about converting existing audio channel structures into arrays. The main audio mixer is provided by the first PCM instance. The non-first audio instances may only have a software mixer for PCM playback.
Improve USB audio mixer support for USB audio class 1 and 2. - make sure volume controls are correctly mapped to "pcm" and "rec" depending on how they deliver audio to the USB host. - make sure there are no duplicate record selections. - remove internal only mixer class type. - don't add software volume controls for recording only. - some minor mixer code cleanup.
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