Merge changes from topic "audio-hal-v4-pi-dev" into pi-dev

* changes:
  Audio V4: Introduce 4.0 shim to HIDL
  Audio V4: Update namespace and version of 4.0 shim
  Audio V4: Copy 2.0 audiohal to 4.0
  Audio V4: *CNT and *MAX are no longer part of the enum