IMS-VT: Listen to sensor orientation changes and update camera preview

- Register to listen to OrientationEventListener

- Notify registrants of orientation changes and update camera
  preview size and orientation based on that.

- Enable the orientation listener only when CVO is enabled.

- Enable the orientation listener for video calls only. Disable it
  if we downgrade to VOLTE

Bug: 21587367
Change-Id: Id1288ee05fe02ebcfee57e52da060ec5c48ceaac