monet: overlay: Compact cached app heaps in the background

* Background ART heap compaction for cached apps has been recommended for
  Android Go devices for a while, and Google has enabled it for the Pixel
  5 on RQ1A.201205.010. This feature should help fit more cached apps in
  memory

overlay/packages/apps/SimpleDeviceConfig/res/values/config.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2021 The Android Open Source 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>
+    <string-array name="configs_base">
+        <!-- ART heap compaction for cached apps -->
+        <item>activity_manager/use_compaction=true</item>
+    </string-array>
+</resources>