[Community Contribution] yunchang for HUAWEI Ascend NPU

[endymion-ni]

Thank you for your excellent open-sourced xdit and yunchang! We propose a npu adapted version, and thus HUAWEI Ascend NPU users can use xdit and yunchang.

Please consider merging our pull request: #162

[feifeibear]

Thanks a lot for your great contribution! The PR has been merged — really appreciate your work on adapting xdit and yunchang for HUAWEI Ascend NPU.