Prevent modifying mAudioPolicies during iteration

Calling release on a policy from mAudioPolicies removes a key from the
map, causing a ConcurrentHashException.
Defer releases till after iteration completes.

Test: Compiles
Bug: 240314224

Change-Id: I83fa969204d8a9c6ac7bae40f5be57a92813f6be
(cherry picked from commit 6f837517a2a9106deac7bb076db1cf78f72e0438)
Merged-In: I83fa969204d8a9c6ac7bae40f5be57a92813f6be
1 file changed