[Plugin] Fix bug of memcpy in scatter plugin #3818
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In the scatter plugin,
cudaMemcpywith implicit synchronization is used to complete data copying, ensuring thatdevice_transform_coeffis properly assigned before the kernel execution. However, this method fails when usingcudaStreamNonBlockingstream for inference in TensorRT, resulting in incorrect outcomes. This issue can be resolved by switching tocudaMemcpyAsyncand using the same stream as the kernel, yielding correct results.