AudioEffect: make effect descriptor parcelable

Make AudioEffect.Descriptor class parcelable so that a list of
active effects can be included into AudioRecordingConfiguration.

Note: AudioEffect.Descriptor class was made final but it is OK as it
was never consumed by any SDK API.

Bug: 111438757
Test: make
Change-Id: I238b4ea47c613fd2abacc8729d9baf31423283a4