Disabling restore for below L devices

Change-Id: I262f52e88421637e0d50c048f6d53c6b5754da4e
diff --git a/src/com/android/launcher3/LauncherBackupAgentHelper.java b/src/com/android/launcher3/LauncherBackupAgentHelper.java
index c20c693..09ad22b 100644
--- a/src/com/android/launcher3/LauncherBackupAgentHelper.java
+++ b/src/com/android/launcher3/LauncherBackupAgentHelper.java
@@ -78,6 +78,12 @@
     @Override
     public void onRestore(BackupDataInput data, int appVersionCode, ParcelFileDescriptor newState)
             throws IOException {
+        if (!Utilities.isLmpOrAbove()) {
+            // No restore for old devices.
+            Log.i(TAG, "You shall not pass!!!");
+            Log.d(TAG, "Restore is only supported on devices running Lollipop and above.");
+            return;
+        }
         super.onRestore(data, appVersionCode, newState);
 
         // If no favorite was migrated, clear the data and start fresh.