Revert^2 "Audio CAP: Address ANAPIC comments, Part 3."

Refactor the stable version of parcelables `AudioPolicyForceUse`
and `AudioPolicyForcedConfig` for better structure. The tag of
the `AudioPolicyForceUse` union is equivalent to the old enum
with the same name. The value of the union replaces
the old `AudioPolicyForcedConfig` enum.

The list of allowed values has been moved into the XSD
schema 'audio_policy_engine_configuration.xsd'.

Bug: 364310317
Test: atest VtsHalAudioCoreTargetTest
Change-Id: I85f58f3310842679b9bf80cad3ac2494c4527ea2