Move biometric setting observer from KeyguardUpdateMonitor to BiometricService

Fixes: 116872423

Test: with additional logging, do
      adb shell settings put secure face_unlock_keyguard_enabled 1 (or 0)
Test: content observer updates when user changes
Test: clients receive the current state upon registering

Change-Id: Id37381a8c263b29a0b91abb5241d74bb52364d63
diff --git a/Android.bp b/Android.bp
index faad6f3..9f93d39 100644
--- a/Android.bp
+++ b/Android.bp
@@ -152,9 +152,10 @@
         ":libcamera_client_framework_aidl",
         "core/java/android/hardware/IConsumerIrService.aidl",
         "core/java/android/hardware/ISerialManager.aidl",
+        "core/java/android/hardware/biometrics/IBiometricEnabledOnKeyguardCallback.aidl",
+        "core/java/android/hardware/biometrics/IBiometricPromptReceiver.aidl",
         "core/java/android/hardware/biometrics/IBiometricService.aidl",
         "core/java/android/hardware/biometrics/IBiometricServiceReceiver.aidl",
-        "core/java/android/hardware/biometrics/IBiometricPromptReceiver.aidl",
         "core/java/android/hardware/biometrics/IBiometricServiceLockoutResetCallback.aidl",
         "core/java/android/hardware/display/IDisplayManager.aidl",
         "core/java/android/hardware/display/IDisplayManagerCallback.aidl",