CEC: Revamp volume control action.

Here is a list of changes
1. Change volume control into event base not level base
2. Hide volume ui if volume change is triggered by CEC
3. Report volume change triggered by CEC in OSD message
4. Revamp HdmiLogger so that normal class uses static method only.
5. Apply format message to HdmiLogger's helper methods.

Bug: 17367215

Change-Id: I9f3cd41f7c66f76919059b463df956ed5176b054