HDMI: Fix DeviceDiscoveryAction continuing when removed

Currently, in HdmiCecLocalDevicePlayback the method
`launchDeviceDiscovery` removes an existing DeviceDiscoveryAction to
start a new one.

Removing an action means that the mState is set to STATE_NONE that in
most cases will stop any action from proceeding to another step.
DeviceDiscoveryAction is different because it has a call to poll devices in network. After the poll finished its callback called `startPhysicalAddressStage` that overrides the mState set by the remove before.

Test: atest HdmiCecLocalDevicePlaybackTest
Bug: 317956435

Change-Id: I44747621e96be05f3caf6d4aa18fd2aac895aeeb