Refactor code for building ranging report.

- Take out common code for building ranging report for TwoWay and OwR
  measurements in helper methods.
- Add tests for the case where AngleOfArrivalMeasurement cannot be
  computed as the required field aoaAzimuth is not present.

Test: atest
BugId: 246678053
Change-Id: Ia47243a721496ab4e83dd6ae44ed639b7dc5c311
4 files changed