Add ability to route audio between audio paths

Configfs interface for adding 'routes' is added, and allows two audio paths to chain together particular inputs/outputs, allowing for multistage audio driver handling.

A particular use-case is that of an ADSP driver. We can feed in audio to it, and capture the processed, and/or mixed, audio at it's output, and direct to another audio path driver, such as the UNICENS audio driver.

Signed-off-by: Mark Farrugia <mark.farrugia@fiberdyne.com.au>

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