HDMI: Avoid creating multiple DeviceDiscoveryActions for a local device

After an OTT device wakes-up, a hot-plug can be trigerred by the TV.
Both actions (wake-up & hot-plug) will trigger address allocations which
will end-up launching a `DeviceDiscoveryAction`. This has to be avoided
to not send more messages than necessary and to not have any issues with
the known list of connected devices.

Test: atest HdmiCecLocalDevicePlaybackTest
Bug: 314264570
Bug: 264611886
Change-Id: Ib0e7594d0fb21eaba5934edb8a2b1dc0dc24f6f6