Revert Revert: Enable hidden API blacklist

APIs which have not been explicitly greylisted have so far been put
on the dark greylist. This patch changes the default to blacklist and
therefore enables strict enforcement.

This reverts commit f712b23d.

Bug: 64382372
Test: make
Change-Id: I1608b1adbe5dcafd13335691ddeb94abbb2c6e71