Audio V4: Add new api in XSD

Allow multiple concurrent opened profiles.
Allow mixPort to declare their preferred usage.
Allow to declare the default devicePort for a device type.

Bug: 38184704
Test: xmllint --noout --schema hardware/interfaces/audio/4.0/config/audio_policy_configuration.xsd  --xinclude out/target/product/taimen/vendor/etc/audio_policy_configuration.xml
Change-Id: If2afd9e83f8b023e6229496759dc525497af8d72
Signed-off-by: Kevin Rocard <krocard@google.com>