Audio HAL V5: Introduce HAL V5, equal to V4 for now

Port audio HAL V5 to AOSP for BT HAL.
The implementation is not ported as that would require to port an
additional ~30 patches and is not needed by the BT team.

Bug: 118203066
Test: Compile
Change-Id: If99a5645d19c9780019704ea4f51f8114d83ee8e
Merged-In: If99a5645d19c9780019704ea4f51f8114d83ee8f
Signed-off-by: Kevin Rocard <krocard@google.com>