SoundPool: Enable multithreaded track start

Test: atest SoundPoolOggTest SoundPoolAacTest SoundPoolMidiTest SoundPoolHapticTest
Bug: 319405227
Change-Id: If5e30df1ecb5dad6f5f1d740a20d2a9d82673e77
diff --git a/media/jni/soundpool/StreamManager.cpp b/media/jni/soundpool/StreamManager.cpp
index 52060f1..66fec1c 100644
--- a/media/jni/soundpool/StreamManager.cpp
+++ b/media/jni/soundpool/StreamManager.cpp
@@ -35,10 +35,9 @@
 // In R, we change this to true, as it is the correct way per SoundPool documentation.
 static constexpr bool kStealActiveStream_OldestFirst = true;
 
-// kPlayOnCallingThread = true prior to R.
 // Changing to false means calls to play() are almost instantaneous instead of taking around
 // ~10ms to launch the AudioTrack. It is perhaps 100x faster.
-static constexpr bool kPlayOnCallingThread = true;
+static constexpr bool kPlayOnCallingThread = false;
 
 // Amount of time for a StreamManager thread to wait before closing.
 static constexpr int64_t kWaitTimeBeforeCloseNs = 9 * NANOS_PER_SECOND;