Move LOCK_TO_APP_EXIT_LOCKED from System to Secure

To prepare for controlling from settings.

While here, add lock to app settings to backups.

Bug: 16957435
Change-Id: I059140cd07a7a0d5ceb4e0bfe5e0176cb96629d3
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index 369efac..ca2c223 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -2625,12 +2625,6 @@
         public static final String LOCK_TO_APP_ENABLED = "lock_to_app_enabled";
 
         /**
-         * Whether lock-to-app will lock the keyguard when exiting.
-         * @hide
-         */
-        public static final String LOCK_TO_APP_EXIT_LOCKED = "lock_to_app_exit_locked";
-
-        /**
          * I am the lolrus.
          * <p>
          * Nonzero values indicate that the user has a bukkit.
@@ -2704,6 +2698,7 @@
             POINTER_SPEED,
             VIBRATE_WHEN_RINGING,
             RINGTONE,
+            LOCK_TO_APP_ENABLED,
             NOTIFICATION_SOUND
         };
 
@@ -3666,6 +3661,12 @@
                 "lock_biometric_weak_flags";
 
         /**
+         * Whether lock-to-app will lock the keyguard when exiting.
+         * @hide
+         */
+        public static final String LOCK_TO_APP_EXIT_LOCKED = "lock_to_app_exit_locked";
+
+        /**
          * Whether autolock is enabled (0 = false, 1 = true)
          */
         public static final String LOCK_PATTERN_ENABLED = "lock_pattern_autolock";