Add stub implementation of HdmiCecLocalDeviceAudioSystem

Bug:80297499
Change-Id: I02893148f3970d6635d8ccad99de0f3ab6f5f0f9
Test: lunch atom; m; flashall
(cherry picked from commit 9a9fd4eaec0d36b19b416e3dc429a69088134698)
3 files changed