grus: Set default hotspot ssid

Added a device specific overlay that changes the default name
from "AndroidAp" to customized name

Test: Builds, manually verified name change
Bug: 36368950
Change-Id: I38a5f6fb950d6a45342080bae186a8ed276d94bf

rro_overlays/WifiOverlay/res/values/config.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+ * Copyright (C) 2019 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>
+    <!-- Default access point SSID used for tethering -->
+    <string name="wifi_tether_configure_ssid_default" translatable="false">Xiaomi Mi 9 SE</string>
+</resources>