AudioService: fix cross deadlock in VolumeStreamState

Synchronize modifications of volume index by VolumeStreamState
class mutex instead of using synchronized methods.
This avoids possible cross deadlock when modifying volume on
two stream types simultaneously and one is slave to the other.

Bug: 13730145.

Change-Id: I13406c71010ce0c2e2f08f660b6101f310396c98
Revert "MediaMetadataRetriever: Catch uncatched JNI exceptions"

This reverts commit dc72fc6dee92e017b9ac43b1925599d20bc72445.