sound trigger HAL: add specialized methods for extended sound models

Initial HAL definition was using base struct types
(e.g SoundModel) to pass either a base struct or a struct
extended by composition.
This doesn't work with how autogenerated code passes data
over binder.

Bug: 32022304

Change-Id: I7d4ba6d063e80ba38af3db01043cafc7a084c426