Add dialog for changing display name for mobile network

This CL adds a pencil/edit icon at the top of the mobile network details
page. When clicked, it brings up a dialog that allows the user to set
the display name used for that mobile network - this is most useful in
multi-SIM situations. This dialog also displays the mobile network
operator name and phone number which can help the user keep straight
which one they are renaming.

Bug: 122670283
Test: make RunSettingsRoboTests
Change-Id: Ifd63cfb66ce743bd5ba8a06b52229f06ed56b7bd

res/layout/dialog_mobile_network_rename.xml

@@ -0,0 +1,64 @@
+<?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.
+-->
+<ScrollView
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content">
+
+    <LinearLayout
+        android:orientation="vertical"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:padding="@dimen/sim_content_padding">
+
+        <EditText
+            android:id="@+id/edittext"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:inputType="text"
+            android:maxLength="50"
+            android:singleLine="true">
+            <requestFocus/>
+        </EditText>
+
+        <TextView
+            style="@style/device_info_dialog_label"
+            android:id="@+id/operator_name_label"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/status_operator"/>
+        <TextView
+            style="@style/device_info_dialog_value"
+            android:id="@+id/operator_name_value"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/device_info_not_available"/>
+
+        <TextView
+            style="@style/device_info_dialog_label"
+            android:id="@+id/number_label"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/status_number_sim_status"/>
+        <TextView
+            style="@style/device_info_dialog_value"
+            android:id="@+id/number_value"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/device_info_not_available"/>
+
+    </LinearLayout>
+</ScrollView>