Add copyright headers, Part 1/2

Summary:
Added license in this diff (D47737882)

Now adding header according to https://www.internalfb.com/intern/wiki/Open_Source/Licenses/Straight_BSD/

Following these instructions:

https://www.internalfb.com/intern/wiki/Linting/License_Lint/

Reviewed By: cccclai

Differential Revision: D47783667

fbshipit-source-id: 067df6f82f868ba109ef45db3b6092f6d1944330

Author: mergennachin

backends/xnnpack/passes/conv1d_unsqueeze_pass.py

@@ -1,3 +1,9 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree.
+
 import torch
 from executorch.exir.dialects._ops import ops as exir_ops
 from executorch.exir.pass_base import ExportPass, PassResult
@@ -69,7 +75,7 @@ def call(self, graph_module: torch.fx.GraphModule):
                         node.args[8],
                     )
 
-                    # (c) Add unsqueeze to input (3d -> 4d) and squeeze to output (4d -> 3d)
+                    # c. Add unsqueeze to input (3d -> 4d) and squeeze to output (4d -> 3d)
                     # unsqueeze -> conv2d -> squeeze
                     with graph.inserting_before(node):
                         input_node = node.args[0]

exir/tests/models.py

@@ -1,6 +1,10 @@
-# pyre-strict
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree.
 
-# (c) Meta Platforms, Inc. and affiliates. Confidential and proprietary.
+# pyre-strict
 
 import itertools
 from typing import List, Optional, Tuple, Union

exir/tests/test_quant_lowering_custom_backend_pass.py

@@ -1,8 +1,10 @@
-# pyre-strict
-
-#!/usr/bin/env fbpython
-# (c) Meta Platforms, Inc. and affiliates. Confidential and proprietary.
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree.
 
+# pyre-strict
 
 import copy
 import logging