fix: use an Intel-only copyright on new XPU graph files

Author: lslusarczyk

tests/unit/torch/backend/test_xpu_graph_backend.py

@@ -1,8 +1,5 @@
-# SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 # Copyright (c) 2026 Intel Corporation
 # SPDX-License-Identifier: Apache-2.0
-#
-# NOTE: This file has been modified by Intel Corporation.
 """Unit tests for XPUGraphBackend."""
 
 import pytest

torch_tweak/torch/backend/xpu_graph_backend.py

@@ -1,8 +1,5 @@
-# SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 # Copyright (c) 2026 Intel Corporation
 # SPDX-License-Identifier: Apache-2.0
-#
-# NOTE: This file has been modified by Intel Corporation.
 """XPU graph backend."""
 
 import warnings