This is so that:
- It's consistent with product configuration
- The return type of board/product config's main functions
and the arguments to printvars can be changed without
also making a change in the soong repository. (what I'm about
to do)
- Removes obsolete TODO
Bug: 221312856
Test: Presubmits
Change-Id: I593f180881eab9521012df202af8f0233bc0b6ae