#15499: Add linear layout to SFLphone home page

res/layout/activity_sflphone_home.xml

@@ -30,9 +30,16 @@ shall include the source code for the parts of OpenSSL used as well
 as that of the covered work.
  -->
 
-<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:id="@+id/pager"
-    android:layout_width="match_parent"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_height="match_parent"
-    tools:context=".SFLPhoneHome" />
\ No newline at end of file
+    android:layout_width="match_parent"
+    android:orientation="vertical"
+    android:gravity="center_horizontal"
+    android:id="@+id/SFLPhoneHomeLayout">
+    <android.support.v4.view.ViewPager
+        xmlns:tools="http://schemas.android.com/tools"
+        android:id="@+id/pager"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        tools:context=".SFLPhoneHome" />
+</LinearLayout>