[Thread] add @RequiresPermissions for unregisterXxxCallback APIs

Per API council review suggestions in b/309952666, add the same
permission requirements for the unregister APIs.

Bug: 309952666
Test: atest CtsThreadNetworkTestCases
Change-Id: Idc481c7676ddc5d748fe7803f74dd63981186c09
diff --git a/framework-t/api/system-current.txt b/framework-t/api/system-current.txt
index b285d85..05cf9e8 100644
--- a/framework-t/api/system-current.txt
+++ b/framework-t/api/system-current.txt
@@ -500,8 +500,8 @@
     method @RequiresPermission(allOf={android.Manifest.permission.ACCESS_NETWORK_STATE, "android.permission.THREAD_NETWORK_PRIVILEGED"}) public void registerOperationalDatasetCallback(@NonNull java.util.concurrent.Executor, @NonNull android.net.thread.ThreadNetworkController.OperationalDatasetCallback);
     method @RequiresPermission(android.Manifest.permission.ACCESS_NETWORK_STATE) public void registerStateCallback(@NonNull java.util.concurrent.Executor, @NonNull android.net.thread.ThreadNetworkController.StateCallback);
     method @RequiresPermission("android.permission.THREAD_NETWORK_PRIVILEGED") public void scheduleMigration(@NonNull android.net.thread.PendingOperationalDataset, @NonNull java.util.concurrent.Executor, @NonNull android.os.OutcomeReceiver<java.lang.Void,android.net.thread.ThreadNetworkException>);
-    method public void unregisterOperationalDatasetCallback(@NonNull android.net.thread.ThreadNetworkController.OperationalDatasetCallback);
-    method public void unregisterStateCallback(@NonNull android.net.thread.ThreadNetworkController.StateCallback);
+    method @RequiresPermission(allOf={android.Manifest.permission.ACCESS_NETWORK_STATE, "android.permission.THREAD_NETWORK_PRIVILEGED"}) public void unregisterOperationalDatasetCallback(@NonNull android.net.thread.ThreadNetworkController.OperationalDatasetCallback);
+    method @RequiresPermission(android.Manifest.permission.ACCESS_NETWORK_STATE) public void unregisterStateCallback(@NonNull android.net.thread.ThreadNetworkController.StateCallback);
     field public static final int DEVICE_ROLE_CHILD = 2; // 0x2
     field public static final int DEVICE_ROLE_DETACHED = 1; // 0x1
     field public static final int DEVICE_ROLE_LEADER = 4; // 0x4