fstab: add check on userdata partition

Change-Id: Ia08a3ff9bb4177315cc51dcb2a4dec609fd4edd5
m8: Enable offloaded visualizer

 * Since addition of the visualizer tile, devices need to use
   the offloaded visualizer in order for compress offload to
   function. Enable the plugin.
 * Also enable the ultra high quality resampler

Change-Id: I1ad85cb178a93794bc427dfeecfea8e0b04c3537
m8: Enable offload for PCM/AV streaming

 * Also cleanup useless audio policy entries

Change-Id: I1c2e8b4f86a8b16f807896bc3bfa96acd43e1c0a
overlay: route calls to mute mic through AudioManager

Change-Id: Ic92978f9647e510f9bcff6b1d8e9e3efbefdd010