Add secure setting for using biometric

Bug: 183449119
Test: builds
Change-Id: I885cd42a46d4d0cdd6f8bb5cebaf34006bf542b8

core/java/android/provider/Settings.java

@@ -9135,6 +9135,20 @@ public final class Settings {
         public static final String BIOMETRIC_DEBUG_ENABLED =
                 "biometric_debug_enabled";
 
+        /**
+         * Whether or not biometric is allowed on Keyguard.
+         * @hide
+         */
+        @Readable
+        public static final String BIOMETRIC_KEYGUARD_ENABLED = "biometric_keyguard_enabled";
+
+        /**
+         * Whether or not biometric is allowed for apps (through BiometricPrompt).
+         * @hide
+         */
+        @Readable
+        public static final String BIOMETRIC_APP_ENABLED = "biometric_app_enabled";
+
         /**
          * Whether the assist gesture should be enabled.
          *