[help wanted] Support AMD GPU

https://github.com/k2-fsa/sherpa-onnx/pull/153 added support for NVIDIA GPUs.

We also need to support AMD GPUs.

We need to integrate https://onnxruntime.ai/docs/execution-providers/MIGraphX-ExecutionProvider.html into sherpa-onnx.

Help from the community is highly appreciated.

Please leave a comment if you would like to help. We can help you if you meet any problems during the intergration.