Api review: Settings.

Hide notification policy setting.

Bug: 28295513
Change-Id: Ic117285c3eb07cb4bf399e233adad835772b9673
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index d80d4be..12307c5 100755
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -5867,7 +5867,10 @@
         /**
          * Names of the packages that the current user has explicitly allowed to
          * manage notification policy configuration, separated by ':'.
+         *
+         * @hide
          */
+        @TestApi
         public static final String ENABLED_NOTIFICATION_POLICY_ACCESS_PACKAGES =
                 "enabled_notification_policy_access_packages";