Default wake on plug to false for audio system

Changes made:
	1. Audio system device no longer wakes up on hotplug (as was already done for playback devices in change https://googleplex-android-review.git.corp.google.com/c/platform/frameworks/base/+/10319601)
	2. Added unit tests for 1.
	3. Added unit tests for change https://googleplex-android-review.git.corp.google.com/c/platform/frameworks/base/+/10319601

Note: we should consider implementing this change in HdmiCecLocalDeviceSource instead (which is the class HdmiCecLocalDevicePlayback and HdmiCecLocalDeviceAudioSystem extend), to have a streamlined behavior for all future source classes.

Test: N/A
Bug: 149479986

Change-Id: I953af5ea93b609919d768fa98dce47daf62f2f06