[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/cc_attention.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import torch
 import torch.nn as nn
 import torch.nn.functional as F

mmcv/ops/contour_expand.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import numpy as np
 import torch
 

mmcv/ops/corner_pool.py

+# Copyright (c) OpenMMLab. All rights reserved.
 import torch
 from torch import nn
 from torch.autograd import Function

mmcv/ops/csrc/bbox_overlaps_cuda_kernel.cuh

+// Copyright (c) OpenMMLab. All rights reserved
 #ifndef BBOX_OVERLAPS_CUDA_KERNEL_CUH
 #define BBOX_OVERLAPS_CUDA_KERNEL_CUH
 

mmcv/ops/csrc/border_align_cuda_kernel.cuh

+// Copyright (c) OpenMMLab. All rights reserved
 // modified from
 // https://github.com/Megvii-BaseDetection/cvpods/blob/master/cvpods/layers/csrc/border_align/border_align_kernel.cu.
 // the main difference: (1) use `argmax_idx` for fast computing of gradient

mmcv/ops/csrc/carafe_cuda_kernel.cuh

+// Copyright (c) OpenMMLab. All rights reserved
 #ifndef CARAFE_CUDA_KERNEL_CUH
 #define CARAFE_CUDA_KERNEL_CUH
 

mmcv/ops/csrc/carafe_naive_cuda_kernel.cuh

+// Copyright (c) OpenMMLab. All rights reserved
 #ifndef CARAFE_NAIVE_CUDA_KERNEL_CUH
 #define CARAFE_NAIVE_CUDA_KERNEL_CUH
 

mmcv/ops/csrc/cc_attention_cuda_kernel.cuh

+// Copyright (c) OpenMMLab. All rights reserved
 #ifndef CC_ATTENTION_CUDA_KERNEL_CUH
 #define CC_ATTENTION_CUDA_KERNEL_CUH
 

mmcv/ops/csrc/deform_roi_pool_cuda_kernel.cuh

+// Copyright (c) OpenMMLab. All rights reserved
 #ifndef DEFORM_ROI_POOL_CUDA_KERNEL_CUH
 #define DEFORM_ROI_POOL_CUDA_KERNEL_CUH
 

mmcv/ops/csrc/masked_conv2d_cuda_kernel.cuh

+// Copyright (c) OpenMMLab. All rights reserved
 #ifndef MASKED_CONV2D_CUDA_KERNEL_CUH
 #define MASKED_CONV2D_CUDA_KERNEL_CUH
 

mmcv/ops/csrc/nms_cuda_kernel.cuh

+// Copyright (c) OpenMMLab. All rights reserved
 #ifndef NMS_CUDA_KERNEL_CUH
 #define NMS_CUDA_KERNEL_CUH
 

mmcv/ops/csrc/onnxruntime/corner_pool.h

+// Copyright (c) OpenMMLab. All rights reserved
 #ifndef ONNXRUNTIME_CORNER_POOL_H
 #define ONNXRUNTIME_CORNER_POOL_H
 

mmcv/ops/csrc/onnxruntime/cpu/corner_pool.cpp

+// Copyright (c) OpenMMLab. All rights reserved
 #include "corner_pool.h"
 
 #include "../ort_mmcv_utils.h"

mmcv/ops/csrc/onnxruntime/cpu/gridSample.cpp

+// Copyright (c) OpenMMLab. All rights reserved
 #include <cmath>
 
 #include "../ort_mmcv_utils.h"

mmcv/ops/csrc/onnxruntime/cpu/nms.cpp

+// Copyright (c) OpenMMLab. All rights reserved
 #include "nms.h"
 
 #include <assert.h>

mmcv/ops/csrc/onnxruntime/cpu/onnxruntime_register.cpp

+// Copyright (c) OpenMMLab. All rights reserved
 #include "onnxruntime_register.h"
 
 #include "corner_pool.h"

mmcv/ops/csrc/onnxruntime/cpu/reduce_ops.cpp

+// Copyright (c) OpenMMLab. All rights reserved
 #include "reduce_ops.h"
 
 #include <assert.h>

mmcv/ops/csrc/onnxruntime/cpu/roi_align.cpp

+// Copyright (c) OpenMMLab. All rights reserved
 #include "roi_align.h"
 
 #include "../ort_mmcv_utils.h"

mmcv/ops/csrc/onnxruntime/cpu/soft_nms.cpp

+// Copyright (c) OpenMMLab. All rights reserved
 #include "soft_nms.h"
 
 #include <assert.h>

mmcv/ops/csrc/onnxruntime/grid_sample.h

+// Copyright (c) OpenMMLab. All rights reserved
 #ifndef ONNXRUNTIME_GRIDSAMPLE_H
 #define ONNXRUNTIME_GRIDSAMPLE_H