client: Add short audio detector test to kernel suite

- Create a control file to run for 10 seconds.
- Add that control file to the kernel build regression suite as
  experimental.
- Reduce powerd timeouts for short runs.

BUG=chromium-os:33988
TEST=Run power_AudioDetector test successfully

Change-Id: I197a55e2dd43f9312665a9383af68e601aa7a135
Signed-off-by: Simon Que <sque@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/38872
Reviewed-by: Mark Koudritsky <kamrik@chromium.org>
2 files changed