cameraservice: Resolve message vs start/stop preview races

Move the mutex in start/stopPreview to include the metadata message
management. Fast start/stop sequences could (and would) eventually
cause the messages to be enabled/disabled out of sequence (or while
the camera wasn't ready for it)

Fixes BACON-173

Change-Id: I367bc45729ce2e858fea972f35e881a755c6021a
Revert "audio: ID3 tags of most chinese songs display messy"

This reverts commit b8c58116a5850b2daf8d9dde91623dd335737635.

This change causes encoding issues if one has files in a non-UTF8
encoding and uses en_US locale. For details, refer to the JIRA ticket.

JIRA: CYAN-3511
Change-Id: I64751297283038b570cce1eec173f3fbc08db83f
libstagefright: stop audio source before deleting AudioPlayer

-audio source won't be stopped during AudioPlayer destruction
 due to start failed and AUDIOPLAYER_STARTED not set
-handle audio source stop in AwesomePlayer if AUDIOPLAYER_STARTED
 not set

Change-Id: I395c045a0a8a5d5b6ea8cc762d6a2636bb885b0e
CRs-Fixed: 704605