Revert "Doc change: add docs for SafetyNet API."

Reason: Android Auto needs to release ahead of Orla which is delayed.
This change is in the way, right now, but will be re-submitted.

This reverts commit 11e80575660e81d7e053d7fce604bf421ca2f3ce.

Change-Id: I6661e1e780ce8aee9bdaed82fcff4f96fc3349e7
3 files changed