API review cleanups.

- Modify the video call permission check to use the API version of the
caller to determine whether to use the API26
SESSION_EVENT_CAMERA_PERMISSION_ERROR event.  If the caller is using an
older API, use the more generic SESSION_EVENT_CAMERA_FAILURE.
- Update the sample Self Managed calling app to use the incoming call UX
guidance specified in the Javadocs.
- Fix bug in InCallController which could cause InCallService to see
self-managed connections.

Test: Manual
Bug: 35767096
Bug: 35767711
Change-Id: I3e5e2b84eb026eec37f884029bb77d446a04e255
21 files changed