Add methods in HdmiControlService fort port_id/path conversion

Use HdmiPortInfo list to get the port ID from a given routing path,
and vice versa. This is useful when you need to get the HDMI port
to which a certain device is attached in its hierarchy by its routing
path.

Change-Id: If1e7e8fdd005671d4e1fbb04dc26b24885320a92