Audio V4: Copy 2.0 audiohal to 4.0

For easier review of the changes, first copy 2.0 to 4.0, the changes
are made in the following patch.

Bug: 38184704
Test: compile
Change-Id: I5bf16e5f8e7b61cc13e86c06b899ec4e6624a961
Merged-In: I5bf16e5f8e7b61cc13e86c06b899ec4e6624a961
Cherry-picked from master
Signed-off-by: Kevin Rocard <krocard@google.com>