libaudioHAL: reduce version specific code

Bug: 134940862
Test: Plays audio
Change-Id: Ia8c99c0600425321b4b30ac341168101960eed59
Merged-In: Ia8c99c0600425321b4b30ac341168101960eed59
Signed-off-by: Kevin Rocard <krocard@google.com>
8 files changed