aaudio: fix timestamps and underruns

Start the client after we get valid timing data from the server.
That can take a while because of the long cold start times.
The client is synced with the current position of the service.
Now the client can start clean with no underruns.

Bug: 63918065
Test: test_timestamps.cpp
Change-Id: I5d01eb844e4b14cd5477d56ea1dd9e309abc1c52
diff --git a/media/libaaudio/src/client/AudioStreamInternalPlay.h b/media/libaaudio/src/client/AudioStreamInternalPlay.h
index e59d02c..fdb1fd7 100644
--- a/media/libaaudio/src/client/AudioStreamInternalPlay.h
+++ b/media/libaaudio/src/client/AudioStreamInternalPlay.h
@@ -54,6 +54,8 @@
 
     aaudio_result_t requestPauseInternal();
 
+    void advanceClientToMatchServerPosition() override;
+
     void onFlushFromServer() override;
 
 /**