Audio V4: Use the framework audio.h instead of the HAL's

Using the legacy HAL interface was not needed. Only the system audio
header types are used by aaudio.

Test: compile
Bug: 38184704
Change-Id: I321635ef79732eb20864d1349e6a13911ece8da5
Signed-off-by: Kevin Rocard <krocard@google.com>