Add new flag to indicate UI support for multi-user.

Change-Id: Ib0f7f68065cd994691d43ce82c9b3d13f881ed01
diff --git a/overlay/frameworks/base/core/res/res/values/config.xml b/overlay/frameworks/base/core/res/res/values/config.xml
index 51fa7f6..0b20eba 100644
--- a/overlay/frameworks/base/core/res/res/values/config.xml
+++ b/overlay/frameworks/base/core/res/res/values/config.xml
@@ -166,6 +166,8 @@
 
     <!--  Maximum number of supported users -->
     <integer name="config_multiuserMaximumUsers">8</integer>
+    <!-- Whether UI for multi user should be shown -->
+    <bool name="config_enableMultiUserUI">true</bool>
 
     <bool name="config_ui_enableFadingMarquee">false</bool>