Merge sub pages for lock/unlock into 1 xml.

And create PreferenceControllers for each setting

The page is still pretty janky and controllers are invoked manually.
Next CL will clean these up.

Bug: 32953042
Test: TODO
Change-Id: I1d7478324f5de4fdb464d79f89086f7e79c0ee67

src/com/android/settings/fingerprint/FingerprintSettings.java

@@ -974,6 +974,10 @@ public class FingerprintSettings extends SubSettings {
         }
     }
 
+    /**
+     * @deprecated in favor of new SecuritySettings.
+     */
+    @Deprecated
     public static Preference getFingerprintPreferenceForUser(Context context, final int userId) {
         final FingerprintManager fpm = Utils.getFingerprintManagerOrNull(context);
         if (fpm == null || !fpm.isHardwareDetected()) {