Revert "Nullability Annotations replacement"

This reverts commit cf0501e4d7.

Reason for revert: b/317462033, it seems a flaky but revert it first.

Change-Id: Ie1d5e279cca6477fc17d8c27c1ecda8d7a6b2553

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

@@ -15,10 +15,9 @@
  */
 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}