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