Merge "Update biometric constant docs from tier to class" into rvc-dev am: 29d2bf12 am: 9512587f am: 72455f57

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11840347

Change-Id: I05c75a51212c01d256c2546aa9aef351fd2666ee