Cert Test: Stop using cert API protos and user layer N-1 to test layer N

* Instead of having a separate certification stack, trying to simplify
  the testing model by moving the implementation of the certification
  stack to Python on top of the underlying layer
* This means that when testing layer N, the certification device will
  be using layer N-1 and a Python based certification stack or event
  handler
* Migrate SimpleHalTest to use facade APIs only
* Remove build rules and files related to HAL cert APIs

Bug: 146082036
Test: Run SimpleHalTests
Change-Id: I304ff425f7bb42da17a71914faeee8f20118007b