overlay: SystemUI: Enable production-ready feature flags

- Conversations: enabled by default on Pixel
- Charging ripple: enabled by default on Pixel

Change-Id: I02b8d268cf750d13aa8b1864aa3bcf46bf820e18

overlay/common/frameworks/base/packages/SystemUI/res/values/flags.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    Copyright (C) 2021 The Proton AOSP Project
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
+<resources>
+    <bool name="flag_conversations">true</bool>
+    <bool name="flag_charging_ripple">true</bool>
+</resources>