[CEC] Standby when <Active Source> lost

Add an option to go to standby when <Active Source> received from other device

For better configurability, a "ro.hdmi.cec.source.power_state_change_on_active_source_lost" system property is introduced which controls the new behaviour.

Bug: 156367087
Test: manually tested on a device
Change-Id: I7a068064bb5e867fd364d2b84c7066db06baec3e
Merged-In: I7a068064bb5e867fd364d2b84c7066db06baec3e
3 files changed