HdmiControlManager with HdmiPlaybackClient API definition

This is a rewrite of HdmiCecManager that exposes API for CEC Playback
device control. HdmiCecManager will be removed together with
HdmiCecService once the migration is completed.

Replaced direct access to CEC commands with the following 2 API:
- oneTouchPlay
- queryDisplayStatus

Each method requires communication with other device on CEC bus,
hence might take some time to finish. The result at the end of
protocol exchange is reported through a callback provided as a
parameter to the method.

The callback is based on interface not abstract class since
it has only one method 'onComplete'.

Change-Id: I41e9d4571f890303282a79a803c86530d0b46974