[Docs] Add header for files (#1181)

* [Docs] Add header for files

* change to OpenMMLab

* add headers for .cpp, .cu, .h, .cuh

* replace Open-MMLab with OpenMMLab

mmcv/ops/csrc/pytorch/deform_roi_pool.cpp

+// Copyright (c) OpenMMLab. All rights reserved
 #include "pytorch_cpp_helper.hpp"
 
 #ifdef MMCV_WITH_CUDA

mmcv/ops/csrc/pytorch/deform_roi_pool_cuda.cu

+// Copyright (c) OpenMMLab. All rights reserved
 #include "deform_roi_pool_cuda_kernel.cuh"
 #include "pytorch_cuda_helper.hpp"
 

mmcv/ops/csrc/pytorch/focal_loss.cpp

+// Copyright (c) OpenMMLab. All rights reserved
 #include "pytorch_cpp_helper.hpp"
 
 #ifdef MMCV_WITH_CUDA

mmcv/ops/csrc/pytorch/focal_loss_cuda.cu

+// Copyright (c) OpenMMLab. All rights reserved
 #include "pytorch_cuda_helper.hpp"
 #include "sigmoid_focal_loss_cuda_kernel.cuh"
 #include "softmax_focal_loss_cuda_kernel.cuh"

mmcv/ops/csrc/pytorch/info.cpp

+// Copyright (c) OpenMMLab. All rights reserved
 // modified from
 // https://github.com/facebookresearch/detectron2/blob/master/detectron2/layers/csrc/vision.cpp
 #include "pytorch_cpp_helper.hpp"

mmcv/ops/csrc/pytorch/masked_conv2d.cpp

+// Copyright (c) OpenMMLab. All rights reserved
 #include "pytorch_cpp_helper.hpp"
 
 #ifdef MMCV_WITH_CUDA

mmcv/ops/csrc/pytorch/masked_conv2d_cuda.cu

+// Copyright (c) OpenMMLab. All rights reserved
 #include "masked_conv2d_cuda_kernel.cuh"
 #include "pytorch_cuda_helper.hpp"
 

mmcv/ops/csrc/pytorch/modulated_deform_conv.cpp

+// Copyright (c) OpenMMLab. All rights reserved
 #include "pytorch_cpp_helper.hpp"
 
 #ifdef MMCV_WITH_CUDA

mmcv/ops/csrc/pytorch/modulated_deform_conv_cuda.cu

+// Copyright (c) OpenMMLab. All rights reserved
 #include "modulated_deform_conv_cuda_kernel.cuh"
 #include "pytorch_cuda_helper.hpp"
 

mmcv/ops/csrc/pytorch/nms.cpp

+// Copyright (c) OpenMMLab. All rights reserved
 #include "pytorch_cpp_helper.hpp"
 
 #ifdef MMCV_WITH_CUDA

mmcv/ops/csrc/pytorch/nms_cuda.cu

+// Copyright (c) OpenMMLab. All rights reserved
 #include "nms_cuda_kernel.cuh"
 #include "pytorch_cuda_helper.hpp"
 

mmcv/ops/csrc/pytorch/pixel_group.cpp

+// Copyright (c) OpenMMLab. All rights reserved
 // It is modified from https://github.com/WenmuZhou/PAN.pytorch
 
 #include "pytorch_cpp_helper.hpp"

mmcv/ops/csrc/pytorch/psamask.cpp

+// Copyright (c) OpenMMLab. All rights reserved
 // Modified from
 // https://github.com/hszhao/semseg/blob/master/lib/psa/src
 #include "pytorch_cpp_helper.hpp"

mmcv/ops/csrc/pytorch/psamask_cuda.cu

+// Copyright (c) OpenMMLab. All rights reserved
 // Modified from
 // https://github.com/hszhao/semseg/blob/master/lib/psa/src
 

mmcv/ops/csrc/pytorch/pybind.cpp

+// Copyright (c) OpenMMLab. All rights reserved
 #include "pytorch_cpp_helper.hpp"
 
 std::string get_compiler_version();

mmcv/ops/csrc/pytorch/roi_align.cpp

+// Copyright (c) OpenMMLab. All rights reserved
 #include "pytorch_cpp_helper.hpp"
 
 #ifdef MMCV_WITH_CUDA

mmcv/ops/csrc/pytorch/roi_align_cuda.cu

+// Copyright (c) OpenMMLab. All rights reserved
 #include "pytorch_cuda_helper.hpp"
 #include "roi_align_cuda_kernel.cuh"
 

mmcv/ops/csrc/pytorch/roi_align_rotated.cpp

+// Copyright (c) OpenMMLab. All rights reserved
 #include "pytorch_cpp_helper.hpp"
 
 #ifdef MMCV_WITH_CUDA

mmcv/ops/csrc/pytorch/roi_align_rotated_cuda.cu

+// Copyright (c) OpenMMLab. All rights reserved
 #include "pytorch_cuda_helper.hpp"
 #include "roi_align_rotated_cuda_kernel.cuh"
 

mmcv/ops/csrc/pytorch/roi_pool.cpp

+// Copyright (c) OpenMMLab. All rights reserved
 #include "pytorch_cpp_helper.hpp"
 
 #ifdef MMCV_WITH_CUDA