Tell git to ignore new dsp test artifacts.
Tell git to ignore new dsp test artifacts.

No affect to code, just cleans up that output of 'git status'.

Change-Id: I0a15c44c048b64e03a21075955c7653efe3d673c
Signed-off-by: Dylan Reid <c791bfe44996c1eed9c7149a0c5f12a86d58eb85@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/60311
Reviewed-by: Chih-Chung Chang <ebe32a3bdce230d12f75781016b6b880113fb486@chromium.org>

drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd