libaudiohal: Implement updateSource/SinkMetadata

Provide conversions between legacy and AIDL playback and
record track metadata. Use them for implementing
StreamInHalAidl::updateSinkMetadata and
StreamOutHalAidl::updateSourceMetadata.

Bug: 205884982
Bug: 272188499
Test: atest audiorecord_tests trackplayerbase_tests (w/AIDL)
Change-Id: I9278bb7ddbfa926fb1840ba1c51cb2401e949df6