[autotest] audio_AudioBasic*: Remove filters in BT and 3.5mm tests

Bluetooth and 3.5mm jack tests do not need filter because analog signal path
is through audio cable. Remove the filters so we can check the real
signal.

BUG=chromium:573154
TEST=run the tests.

Change-Id: If3a20a856c922d0a5a48f04ad2d0da79a1c222ad
Reviewed-on: https://chromium-review.googlesource.com/320584
Commit-Ready: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Chinyue Chen <chinyue@chromium.org>
5 files changed