Remove extra padding above Access point names in Mobile network of Settings

Bug:73775027
Test: manual test
Change-Id: I0eac47eafbc2f5c2274d7ac872ae34db61ccec0a
diff --git a/res/layout/preference_category_no_label.xml b/res/layout/preference_category_no_label.xml
new file mode 100644
index 0000000..becfba7
--- /dev/null
+++ b/res/layout/preference_category_no_label.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2018 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.
+  -->
+
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+       android:layout_width="match_parent"
+       android:layout_height="1dp"
+       android:background="?android:attr/dividerHorizontal"/>
+
+
diff --git a/res/xml/gsm_umts_options.xml b/res/xml/gsm_umts_options.xml
index e3e2617..87aa9eb 100644
--- a/res/xml/gsm_umts_options.xml
+++ b/res/xml/gsm_umts_options.xml
@@ -36,7 +36,9 @@
     <!--We want separate APN setting from reset of settings because-->
     <!--we want user to change it with caution.-->
     <PreferenceCategory
-        android:key="category_gsm_apn_key">
+        android:key="category_gsm_apn_key"
+        android:layout="@layout/preference_category_no_label">
+
         <com.android.phone.RestrictedPreference
             android:key="button_gsm_apn_key"
             android:title="@string/apn_settings"