input_flow: Resets audio logic before capturing audio data

For some ChromeOS boards, receiver on Chameleon treats audio data stop as
an error. When receiver is in error state, it does not dump data
anymore. Reset audio logic before recording so receiver can start
dumping new data.

BUG=chromium:623446
TEST=run audio_AudioVolume.hdmi test on nyan_big.

Change-Id: I7fc04714adb6c4e05208906206e1f600a99122d7
Reviewed-on: https://chromium-review.googlesource.com/356336
Commit-Ready: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Shyh-In Hwang <josephsih@chromium.org>
2 files changed