Merge changes from topic "audio-hal-v4"

* changes:
  Audio V4: More fixes of the audio 2.0 API
  Audio V4: Support query microphones information
  Audio V4: Only expose one notification usage
  Audio V4: Add new api in XSD
  Audio V4: Copy audio_policy_configure.xsd 2.0 to 4.0
  Audio V4: Forward tracks attributes to the hal
  Audio V4: Remove deprecated function and enum
  Audio V4: bitfield enum now use the bitfield class
  Audio V4: Add MSD formats and Device
  Audio V4: Add new Audio HAL API
  Audio V4: Remove all non extensible enum value
  Audio V4: Fix doc comments for hidl-doc
  Audio V4: Fix documentation and useable/untestable bugs
  Audio V4: Copy 2.0 .hal files in 4.0