Make LayoutPreference summary text support multiple lines

 Screenshot: https://screenshot.googleplex.com/9YWMSQ4Q8DRd7G9.png

Bug: 178197718
Test: make SettingsLibRoboTests
Change-Id: Ib20e9b383eda884ac53cd8bce1aff998719f400d
diff --git a/packages/SettingsLib/LayoutPreference/res/layout/settings_entity_header.xml b/packages/SettingsLib/LayoutPreference/res/layout/settings_entity_header.xml
index 3f0a06c..50f69d1 100644
--- a/packages/SettingsLib/LayoutPreference/res/layout/settings_entity_header.xml
+++ b/packages/SettingsLib/LayoutPreference/res/layout/settings_entity_header.xml
@@ -64,7 +64,9 @@
             style="@style/TextAppearance.EntityHeaderSummary"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-            android:layout_marginTop="2dp"/>
+            android:layout_marginTop="2dp"
+            android:singleLine="false"
+            android:textAlignment="center"/>
 
         <TextView
             android:id="@+id/entity_header_second_summary"