Revert "Add callback to check biometric prompt status on keyguard"

This reverts commit 6c63e87a.

Reason for revert: AuthController already has a callback (https://source.corp.google.com/h/googleplex-android/platform/superproject/main/+/main:frameworks/base/packages/SystemUI/src/com/android/systemui/biometrics/AuthController.java;bpv=1;bpt=1;l=1358?q=authcontroller&sq=repo:googleplex-android%2Fplatform%2Fsuperproject%2Fmain%20b:main&gsn=Callback&gs=KYTHE%3A%2F%2Fkythe%3A%2F%2Fgoogleplex-android.googlesource.com%2Fplatform%2Fsuperproject%2Fmain%2F%2Fmain%3Flang%3Djava%3Fpath%3Dcom.android.systemui.biometrics.AuthController.Callback%2301ab20683119e9b903a5a1cb1b73be89797de338bf9fbeee470ef43f640c9337) to check biometric prompt status, and since this is intended for system UI only, there is no need for two APIs

Change-Id: Ib2cd168e69f33071dc771863e5f1c2dc8a5bd7ab