Fix default scorer provisioning.

Use Settings.Global instead of SharedPreferences (which don't work) to
track whether we've run the one-time provisioning step of activating
the build-time configured default scorer.

Bug: 16980605
Change-Id: I093cdd6f4f1110960078a186191c4e02b5543d6a
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index 55ba9e9..6e5c992 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -6411,6 +6411,14 @@
         public static final String GUEST_USER_ENABLED = "guest_user_enabled";
 
         /**
+         * Whether the NetworkScoringService has been first initialized.
+         * <p>
+         * Type: int (0 for false, 1 for true)
+         * @hide
+         */
+        public static final String NETWORK_SCORING_PROVISIONED = "network_scoring_provisioned";
+
+        /**
          * Settings to backup. This is here so that it's in the same place as the settings
          * keys and easy to update.
          *