Remove move in conv_cudnn

[MARD1NO]

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[github-actions]

Speed stats:

GPU Name: GeForce GTX 1080 

PyTorch resnet50 time: 138.3ms (= 6915.0ms / 50, input_shape=[16, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 125.8ms (= 6292.2ms / 50, input_shape=[16, 3, 224, 224], backward is enabled)
Relative speed: 1.10 (= 138.3ms / 125.8ms)

PyTorch resnet50 time: 81.9ms (= 4094.7ms / 50, input_shape=[8, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 73.0ms (= 3647.6ms / 50, input_shape=[8, 3, 224, 224], backward is enabled)
Relative speed: 1.12 (= 81.9ms / 73.0ms)

PyTorch resnet50 time: 57.1ms (= 2855.8ms / 50, input_shape=[4, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 51.5ms (= 2572.7ms / 50, input_shape=[4, 3, 224, 224], backward is enabled)
Relative speed: 1.11 (= 57.1ms / 51.5ms)

PyTorch resnet50 time: 48.2ms (= 2408.1ms / 50, input_shape=[2, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 46.9ms (= 2345.4ms / 50, input_shape=[2, 3, 224, 224], backward is enabled)
Relative speed: 1.03 (= 48.2ms / 46.9ms)

PyTorch resnet50 time: 37.1ms (= 1857.2ms / 50, input_shape=[1, 3, 224, 224], backward is enabled)
OneFlow resnet50 time: 51.1ms (= 2552.7ms / 50, input_shape=[1, 3, 224, 224], backward is enabled)
Relative speed: 0.73 (= 37.1ms / 51.1ms)