AudioProductStrategy / AudioVolumeGroups: filters internals

This CL filters internal strategies & volume groups from introspection
getters APIs in java side to prevent volume control/routing on these
strategies/volume groups.

Bug: 316643994
Flag: EXEMPT refactor
Test: manual:  dumpsys audio & check rerouting / patch are not visible.

Signed-off-by: Francois Gaffie <francois.gaffie@renault.com>
Change-Id: I5e7c8bad26a29995a585707c5e9fc77928761077