Add NotificationChannels back for TV variant.

This allows PiP to post notifications properly again.

Bug: 147004007
Test: adb shell input keyevent WINDOW
Change-Id: Ifdce6addfeae854ecc2021946c5a6f8d818f23df
diff --git a/packages/SystemUI/res/values-television/config.xml b/packages/SystemUI/res/values-television/config.xml
index 27db294..4cc5a67 100644
--- a/packages/SystemUI/res/values-television/config.xml
+++ b/packages/SystemUI/res/values-television/config.xml
@@ -22,6 +22,7 @@
 <resources>
     <!-- SystemUI Services: The classes of the stuff to start. -->
     <string-array name="config_systemUIServiceComponents" translatable="false">
+        <item>com.android.systemui.util.NotificationChannels</item>
         <item>com.android.systemui.volume.VolumeUI</item>
         <item>com.android.systemui.stackdivider.Divider</item>
         <item>com.android.systemui.statusbar.tv.TvStatusBar</item>