- US1321 - Now, C++ API users will be able to register multiple types and interfaces

- US1321 - Now, C++ API users will be able to register multiple types and interfaces
  to a resource. The API names may change after review.
- Removed unwanted trailing whitespaces at the end of lines.
- Updated according to review comments.

Change-Id: I13f7fcd07386d4a13d42f00254f870cfbd8ca4b4