Nullability Annotations replacement

-- Replace the android.annotation.Nullable / android.annotation.NonNull
   with androidx.annotation.Nullable / androidx.annotation.NonNull

Bug: 316867690
Test: build pass
Change-Id: I0c1da55dfb09ece855151c47e0492d6f46538621

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}