Combined biometric settings implementation

There will be multiple biometrics authentications existing at the same
time, so we added a new page for multiple biometrics to control
biometrics settings.

Bug: 183449119
Test: manual test
Change-Id: I359082caf771e07dfd5b24973cb8a3cf372c1b30

src/com/android/settings/Utils.java

@@ -841,6 +841,13 @@ public final class Utils extends com.android.settingslib.Utils {
         return faceManager != null && faceManager.isHardwareDetected();
     }
 
+    /**
+     * Return true if the device supports multiple biometrics authentications.
+     */
+    public static boolean isMultipleBiometricsSupported(Context context) {
+        return hasFingerprintHardware(context) && hasFaceHardware(context);
+    }
+
     /**
      * Launches an intent which may optionally have a user id defined.
      * @param fragment Fragment to use to launch the activity.