* changes:
Add DetectTvSystemAudioModeSupportAction
Add tests for HdmiAudioSystemClient
Fix test failure at HdmiCecLocalDeviceAudioSystemTest.
Fix test failure for SystemAudioInitiationActionFromAvrTest.
Checking SYSTEM_AUDIO_CONTROL_ON_POWER_ON property when power on.
Handle atom power off.
Add SystemAudioInitiationActionFromAvr
Handle atom wake up: bring System Audio Control on.
Send audio status at most once per 500 ms
Send <Report audio status> CEC commands when it's changed
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