Fix buzzer test assert without test parameters

Add check for start and stop command

BUG=none
TEST=manaully test

Change-Id: Ied8cda1a0a64e267b477587721525d9c4ec4eeca
Reviewed-on: https://chromium-review.googlesource.com/182043
Reviewed-by: Bowgo Tsai <bowgotsai@chromium.org>
Commit-Queue: Heng-ruey Hsu <henryhsu@chromium.org>
Tested-by: Heng-ruey Hsu <henryhsu@chromium.org>
1 file changed