evita: add Speaker DMIC Stereo use case

Change-Id: I60a22498455b4e2e989a8dff2ca5a96e14044ca3
evita: create filesystems in init, not early-init

* /storage is created in init, meaning these commands fail in early-init

Change-Id: Ia50d2c69a1f837e494c791254e24d8446ba1a6db