AAudio: Completely sync flowgraph with Oboe

AAudio and Oboe flowgraph is not completely in sync.
Any change targetting or another can lead to mistakes.

https://github.com/google/oboe/pull/1524 is the associated
PR over on github.

After these changes, the two repos will be exactly the same.

Bug: 227184807
Bug: 227183850
Test: atest test_various
Test: atest test_flowgraph
Test: atest AAudioTests
Test: play notes on Soundboard
Change-Id: Ifa586abc43c16f49f50d78df0c2a95048933fc0d
diff --git a/media/libaaudio/tests/test_flowgraph.cpp b/media/libaaudio/tests/test_flowgraph.cpp
index 0792fc5..0354d39 100644
--- a/media/libaaudio/tests/test_flowgraph.cpp
+++ b/media/libaaudio/tests/test_flowgraph.cpp
@@ -33,7 +33,7 @@
 #include "flowgraph/SourceI16.h"
 #include "flowgraph/SourceI24.h"
 
-using namespace flowgraph;
+using namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph;
 
 constexpr int kBytesPerI24Packed = 3;