Revert "[ADI][4/N] APIs for verification policy and failure reasons"

FLAG: EXEMPT just revert
BUG: 422535876
Test: n/a just revert

This reverts commit b38bf933.
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:940f336d9cc5e351929dc5590db6ec41747ef798)
Merged-In: I1458ccb8466d2f9b6eb5b1c121e3de3d34dad8b0
Change-Id: I1458ccb8466d2f9b6eb5b1c121e3de3d34dad8b0