alsa-mixer: Add an explicit profile for Audigy2 devices

Merged Arun Raghavan requested to merge arun/pulseaudio:audigy2-fix into master

These lost analog-mono support when we made that a fallback profile, as the stereo-fallback would be picked up as the only input profile, and that does not work in duplex mode.

This profile set just recreates exactly the same config that we autoprobed, down to the profile priorities.

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