Allow device to have use Audio HAL V6

This HAL is optional for now as breaking changed are planned.
It might get required for new device before R release.

Test: push V6 to device and check audio works fine
Bug: 134940862
Change-Id: Ib4a906da1c1d3d489003a6642bfc55b142424155
Signed-off-by: Kevin Rocard <krocard@google.com>