add license in file (#303)

example/01_gemm/gemm_dl_fp16.cpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.
+
 #include <iostream>
 #include <numeric>
 #include <initializer_list>

example/01_gemm/gemm_dl_fp32.cpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.
+
 #include <iostream>
 #include <numeric>
 #include <initializer_list>

example/01_gemm/gemm_dl_int8.cpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.
+
 #include <iostream>
 #include <numeric>
 #include <initializer_list>

example/01_gemm/gemm_xdl_bf16.cpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.
+
 #include <iostream>
 #include <numeric>
 #include <initializer_list>

example/01_gemm/gemm_xdl_fp16.cpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.
+
 #include <iostream>
 #include <numeric>
 #include <initializer_list>

example/01_gemm/gemm_xdl_fp64.cpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.
+
 #include <iostream>
 #include <numeric>
 #include <initializer_list>

example/01_gemm/gemm_xdl_int8.cpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.
+
 #include <iostream>
 #include <numeric>
 #include <initializer_list>

example/02_gemm_alpha_beta/gemm_xdl_alpha_beta.cpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.
+
 #include <iostream>
 #include <numeric>
 #include <initializer_list>

example/03_gemm_bias_relu/gemm_xdl_bias_relu.cpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.
+
 #include <iostream>
 #include <numeric>
 #include <initializer_list>

example/04_gemm_add_add_fastgelu/gemm_add_add_fastgelu_xdl_fp16.cpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.
+
 #include <iostream>
 #include <numeric>
 #include <initializer_list>

example/06_conv2d_fwd_bias_relu/conv2d_fwd_xdl_bias_relu.cpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.
+
 #include <iostream>
 #include <numeric>
 #include <initializer_list>

example/07_conv2d_fwd_bias_relu_add/conv2d_fwd_xdl_bias_relu_add.cpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.
+
 #include <iostream>
 #include <numeric>
 #include <initializer_list>

example/09_convnd_fwd/convnd_fwd_xdl_fp16.cpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.
+
 #include <cstdlib>
 #include <iostream>
 #include <numeric>

example/09_convnd_fwd/convnd_fwd_xdl_fp32.cpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.
+
 #include <cstdlib>
 #include <iostream>
 #include <numeric>

example/09_convnd_fwd/convnd_fwd_xdl_fp64.cpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.
+
 #include <cstdlib>
 #include <iostream>
 #include <numeric>

example/09_convnd_fwd/convnd_fwd_xdl_int8.cpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.
+
 #include <cstdlib>
 #include <iostream>
 #include <numeric>

example/10_conv2d_bwd_data/conv2d_bwd_data_xdl.cpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.
+
 #include <iostream>
 #include <numeric>
 #include <initializer_list>

example/11_conv2d_bwd_weight/conv2d_bwd_weight_xdl.cpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.
+
 #include <iostream>
 #include <numeric>
 #include <initializer_list>

example/12_reduce/reduce_blockwise.cpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.
+
 #include <iostream>
 #include <numeric>
 #include <initializer_list>

example/12_reduce/reduce_blockwise_two_call.cpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.
+
 #include <iostream>
 #include <numeric>
 #include <sstream>