Verify that the <Standby> message is sent on next standby

When POWER_STATE_CHANGE_ON_ACTIVE_SOURCE_LOST option is set to STANDBY_NOW.

Bug: 161097846
Test: atest HdmiCecLocalDevicePlaybackTest
Change-Id: Ifcef1b7f79653fee6e958ae9964b435d93ee5452
1 file changed