[v1.9.x] Make sure files with 2 licenses are listed properly in LICENSE. (#20492) (#20519)

* Make sure files with 2 licenses are listed properly in LICENSE.

* Remove ASF copyright line.

Author: josephevans

LICENSE

@@ -250,7 +250,6 @@
     docs/python_docs/themes/mx-theme
     3rdparty/intgemm
     3rdparty/tvm/3rdparty/compiler-rt/builtin_fp16.h
-    src/operator/nn/layer_norm.cc
 
     =======================================================================================
     3-clause BSD license
@@ -268,9 +267,6 @@
     3rdparty/googletest/googletest
     cmake/upstream/FindCUDAToolkit.cmake
     cmake/upstream/select_compute_arch.cmake
-    src/operator/numpy/np_einsum_op-inl.h
-    src/operator/numpy/np_einsum_path_op-inl.h
-    src/operator/numpy/np_einsum_op.cc
     src/operator/contrib/erfinv-inl.h
 
     =======================================================================================
@@ -314,6 +310,9 @@
     python/mxnet/onnx/mx2onnx/_export_onnx.py
     python/mxnet/onnx/mx2onnx/_op_translations/_op_translations_opset12.py
     python/mxnet/onnx/mx2onnx/_op_translations/_op_translations_opset13.py
+    src/operator/numpy/np_einsum_op-inl.h
+    src/operator/numpy/np_einsum_path_op-inl.h
+    src/operator/numpy/np_einsum_op.cc
 
     =======================================================================================
     Apache-2.0 license + MIT License
@@ -322,6 +321,7 @@
     src/serialization/cnpy.h (Copy of the AL2 License available at the top of this file, MIT License available at licenses/MIT)
     src/serialization/cnpy.cc (Copy of the AL2 License available at the top of this file, MIT License available at licenses/MIT)
     3rdparty/onnx-tensorrt/third_party/onnx/tools/protoc-gen-mypy.py (Copy of the referenced AL2 License available at top of current file)
+    src/operator/nn/layer_norm.cc (function LayerNormCPUKernel is adapated from MIT-licensed code)
 
     =======================================================================================
     Apache-2.0 license + Boost Software License, Version 1.0

src/operator/numpy/np_einsum_op-inl.h

@@ -19,7 +19,6 @@
 
 /*
  * Copyright (c) 2005-2019, NumPy Developers.
- * Copyright (c) 2019, The Apache Software Foundation.
  *
  * All rights reserved.
  *