m8: Update audio configuration

 * Correct audio_policy, use low latency primary

Change-Id: I439137898434695e2528356718f18b67f0cb1c2c
m8: Enable low-latency audio capture

Change-Id: I470dc8fc281093dfe5f77914fa7af4e60daf87c9
m8: Update policy for time_helper device

 * Add policy for timestamp generator device

Change-Id: I81283b1f9a32958415bce6dc6a1dcb881c6cb14b
m8: Update media codecs and audio properties

Change-Id: Ica481da7b633632575cb6c133ed9133df2dacf03