aaudio: fix intermittent hang and position error

Fix hang caused by recursive mutex.
Fix disconnect caused by getPosition() failing, which was
just because the stream wasn't ready yet.

Bug: 63775537
Bug: 63709749
Test: run "aaudio_loopback -pl -Pl -c2 -n6 -te -m" many times
Change-Id: Ic1d54360b55cfc8ecc1809584c262bc0976c58bb
diff --git a/services/oboeservice/AAudioServiceEndpoint.h b/services/oboeservice/AAudioServiceEndpoint.h
index ed995e5..e40a670 100644
--- a/services/oboeservice/AAudioServiceEndpoint.h
+++ b/services/oboeservice/AAudioServiceEndpoint.h
@@ -73,13 +73,13 @@
 
     virtual AudioStreamInternal *getStreamInternal() = 0;
 
-    std::atomic<bool>        mCallbackEnabled;
+    std::atomic<bool>        mCallbackEnabled{false};
 
     mutable std::mutex       mLockStreams;
 
     std::vector<android::sp<AAudioServiceStreamShared>> mRegisteredStreams;
 
-    size_t                   mRunningStreams = 0;
+    std::atomic<int>         mRunningStreams{0};
 
 private:
     aaudio_result_t startSharingThread_l();