Apply the correct theme to DockPreference

Set the preference context to apply correct theme to preference.

Bug: 110016611
Test: m -j SettingsRoboTests RunSettingsRoboTests
Change-Id: Ifb680fdc0ff40f86886f91320b4187e9873efbf4

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

@@ -15,6 +15,7 @@
  */
 package com.android.settings.connecteddevice.dock;
 
+import android.annotation.NonNull;
 import android.content.Context;
 
 /**
@@ -40,4 +41,10 @@ public interface DockUpdater {
      */
     default void forceUpdate() {
     }
+
+    /**
+     * Set the context to generate the {@link Preference}, so it could get the correct theme.
+     */
+    default void setPreferenceContext(@NonNull Context preferenceContext) {
+    }
 }