Add Sleep button to Global Power Options

Change-Id: Ia3816d94d2392aa9682694a7d33b5bc06489e965
diff --git a/core/res/res/values/bliss_config.xml b/core/res/res/values/bliss_config.xml
index 616de6e..4a9f5d7 100644
--- a/core/res/res/values/bliss_config.xml
+++ b/core/res/res/values/bliss_config.xml
@@ -65,6 +65,7 @@
         <item>emergency</item>
         <item>lockdown</item>
         <item>power</item>
+        <item>sleep</item>
         <item>restart</item>
         <item>screenshot</item> <!--2 buttons nav-->
     </string-array>