Split the 6 channels of input I have from my audio interface into 2
separate channels for inputs 1 and 2, so that I can have only the one
microphone feed into video chat apps.
The way this is done right now is less than ideal as it doesn't support
any sort of hotplugging - at some point, I should figure out the
appropriate udev invocations to make that work.
Change-Id: I53dc363173fa8db591b0e9cb08258d90835c1109
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2249
Tested-by: BuildkiteCI
Reviewed-by: glittershark <grfn@gws.fyi>