fstab: add check on userdata partition

Change-Id: Ia08a3ff9bb4177315cc51dcb2a4dec609fd4edd5

Conflicts:
	rootdir/etc/fstab.qcom
m8: Enable offload for PCM/AV streaming

 * Also cleanup useless audio policy entries

Change-Id: I1c2e8b4f86a8b16f807896bc3bfa96acd43e1c0a

Conflicts:
	audio/audio_policy.conf
m8: Cleanup audio policy

 * Fix noise when playing notifications too

Change-Id: Ibe152597cd82afd6035c1b59b1517dc922242928