Update preloaded-classes-blacklist

To match what was used for RVC profile.

Bug: 152574358
Test: Config file used in boot image profile generation
Change-Id: I5be50e9ec2a43d82dd5225b2f685897afa40d818

config/preloaded-classes-blacklist

@@ -2,6 +2,7 @@ android.content.AsyncTaskLoader$LoadTask
 android.net.ConnectivityThread$Singleton
 android.os.AsyncTask
 android.os.FileObserver
+android.os.NullVibrator
 android.speech.tts.TextToSpeech$Connection$SetupConnectionAsyncTask
 android.widget.Magnifier
-
+com.android.server.BootReceiver$2