AAudio should not use legacy path if not allowed

Test: mmm frameworks/av/media/libaaudio/examples && adb sync data &&
      adb shell ! /data/nativetest64/write_sine_callback/write_sine_callback -m3
Change-Id: Ie17c4037c4b61caed07748a0ae79ec950da3c802
Signed-off-by: Kevin Rocard <krocard@google.com>