Revert^2 "Nullability Annotations replacement"

This reverts commit 19d1d3d15d.

Reason for revert: revert it because this is not the root cause.

bug: 316867690
Change-Id: I0f168dbb64044aa720202af7b1040afd4f028c9c

src/com/android/settings/connecteddevice/dock/DockUpdater.java

@@ -15,9 +15,10 @@
  */
 package com.android.settings.connecteddevice.dock;
 
-import android.annotation.NonNull;
 import android.content.Context;
 
+import androidx.annotation.NonNull;
+
 /**
  * Update the dock devices. It notifies the upper level whether to add/remove the preference
  * through {@link DevicePreferenceCallback}