Merge "Update biometric constant docs from tier to class" into rvc-dev am: 29d2bf12 am: 9512587f am: 8a69ae04

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

Change-Id: Id1a3a0a74c478912bfd31a953f654bedc660adde