Enable CUDNN for conv1D (#11194) (#11270)
Enable CUDNN for conv1D (#11194) (#11270)

* enable cudnn for conv1d

* add checks for backward

* fix build

* fix build

* fix lint

* Update convolution.cc
TuSimple/mxnet,TuSimple/mxnet,TuSimple/mxnet,TuSimple/mxnet,TuSimple/mxnet,TuSimple/mxnet,TuSimple/mxnet,TuSimple/mxnet,TuSimple/mxnet,TuSimple/mxnet