audiopolicy: Refactor XML deserializer for the APM config
-- Move deserialization traits classes into the .cpp file;
-- Use unique_ptr for managing libxml objects lifetime;
-- Define node and attribute names inline. This makes them
inlined in the code, but that's OK since they are typically
only used once.
-- Avoid using reference types for "out" parameters.
-- Check the status of deserializing collections.
-- Misc renamings and generalizations for clarity.
Test: Compare dumpsys media.audio_policy A/B, check audio
Change-Id: Ib188964dee94acbccd701a58d45d3df206487d81
3 files changed