Only initialize sniffers once, don't hold mutex while sniffing

b/11482896

Change-Id: Ie036554b4c9e7e8863cb07901d414ea457f1b2f1
(cherry picked from commit 377fce69297a0e5b7c3b266a7602b17146785635)
Fix Build

Change-Id: Id09c03680869ccc629d78289ed614b3be94f7b3b
Revert "audioflinger: fix track terminated before playing"

This reverts commit 231ff07f018ff16c99fcbfe31a14aab967df4e89.