Add code coverage support for robolectric tests

- Added targets to generate coverage reports after running robolectric
tests.
- Use suffix: ${target}-jacoco to run. For example, to run cobertura for
setupwizard tests, use:
  make RunSuwRoboTests-jacoco
- Generated reports are placed under
    $OUT/obj/FAKE/${project}_intermediates/coverage/

bug:32617403
Test: Ran manually, verified that reports are generated.
Change-Id: Ia1da0a642901de02bffbbc1d7a0e0d33e9ea3eab