V2: Update tests for multihal to test HAL 2.1

Updates tests and fake subhals to support Multi-HAL 2.1 to make
on-device testing feasible.

Bug: 149758467
Test: Verify that the new unit tests and subhals in this topic load and
run on a Pixel device

Change-Id: I7a9d7c1678826bb1956119e8b76f591c7bc213e1