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