Clean up dead objects when detected in the SoundTriggerHelper

If an app has died while being connected to the sound trigger helper/the
binder goes away, we should stop and unload the model since there's no
way to get a handle on it again (without reloading the same UUID at some
point).

Test: Force stop the SoundTriggerTestApp while it has a model started,
trigger the sound model, then watch it get unloaded when the helper
notices that the binder is dead.

Change-Id: Iddfaaa03482d56e71f23e5982d4bd579f386b51d
1 file changed