pal: release RM mutex before calling device setParam for A2dpSuspend

If some thread has acquired activeStreamMutex and is waiting for RM mutex.
If we will call a2dpSuspend device setParam with RM mutex held, deadlock
condition might happen as a2dpSuspend needs to get active streams over A2dp
which requires activeStreamMutex.

Thus, releasing RM mutex before calling device setParam for A2dpSuspend.

Change-Id: I0288b2511ac1788efd2b02d4742eee071eef6a8b
1 file changed