Fix torch version check for SM100 mxfp4

[zifeitong]

Fixes gpt-oss models on main with blackwell.

My understanding is that mxfp4+blackwell+torch 2.7 is supported.

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[gemini-code-assist]

Code Review

This pull request fixes an issue where the torch version check for mxfp4 was overly broad, applying to all GPU architectures instead of just Hopper. The change correctly scopes this check, along with the Triton kernel check, to only apply to Hopper GPUs. This allows using mxfp4 on newer architectures like Blackwell with different torch versions.

My main feedback is to consider adding explicit checks for Blackwell and newer architectures to make the code more robust and prevent potential runtime errors if their specific requirements are not met. I've provided a suggestion to add these checks.

[zyongye]

Your understanding is correct. Thank you.