vendor: Enable double tap to sleep

* Note: Settings page has not been pushed to AOSP yet we are currently using
  reverse engineered one from Pixel stock rom

overlay/no-rro/frameworks/base/core/res/res/values/config.xml

@@ -33,4 +33,9 @@
     <string name="config_defaultContextualSearchKey">omni.entry_point</string>
     <string name="config_defaultContextualSearchLegacyEnabled">omni.enable_vis</string>
     <string name="config_defaultContextualSearchPackageName" translatable="false">com.google.android.googlequicksearchbox</string>
+
+    <!-- Whether device supports double tap to sleep. This will allow the user to enable/disable
+         double tap gestures in non-action areas in the lock screen and launcher workspace to go to
+         sleep. -->
+    <bool name="config_supportDoubleTapSleep">true</bool>
 </resources>

release/aconfig/bp3a/com.android.systemui/double_tap_to_sleep_flag_values.textproto

@@ -0,0 +1,6 @@
+flag_value {
+  package: "com.android.systemui"
+  name: "double_tap_to_sleep"
+  state: ENABLED
+  permission: READ_ONLY
+}