dut: Allow implicit and explicit creating Audio controllers.

Some boards may have both Alsa and TinyAlsa userland programs available
at the same time so we do want to create right component if that's
already known in board configuration, and only detect if required.

BUG=none
TEST=make test

Change-Id: I8c8dcc5db882adc21b29b1c93fa0f113aecf61a0
Reviewed-on: https://chromium-review.googlesource.com/356980
Commit-Ready: Hung-Te Lin <hungte@chromium.org>
Tested-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
3 files changed