aaudio: name threads for easier debugging

Name them "AAudio_#" where # is an increasing index.
For example AAudio_1, AAudio_2, etc.

Also name threads that are used for sending timestamps.

Test: run write_sine_callback then dump the threads for that process.
Change-Id: Ibd8c7be1109f6c15a4601ef154038cdce2e65e11
diff --git a/services/oboeservice/AAudioServiceStreamBase.cpp b/services/oboeservice/AAudioServiceStreamBase.cpp
index 53d2860..864fc35 100644
--- a/services/oboeservice/AAudioServiceStreamBase.cpp
+++ b/services/oboeservice/AAudioServiceStreamBase.cpp
@@ -42,7 +42,7 @@
 
 AAudioServiceStreamBase::AAudioServiceStreamBase(AAudioService &audioService)
         : mUpMessageQueue(nullptr)
-        , mTimestampThread()
+        , mTimestampThread("AATime")
         , mAtomicTimestamp()
         , mAudioService(audioService) {
     mMmapClient.clientUid = -1;