[Bug] FP8: Misuse dynamic per token quant on ROCm

[HaiShaw]

Checklist

• 1. I have searched related issues but cannot get the expected help.
• 2. The bug has not been fixed in the latest version.
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Describe the bug

https://github.com/sgl-project/sglang/blob/main/python/sglang/srt/layers/quantization/fp8_utils.py#L242-L248

The else case (applied to ROCm - current), used the wrong API.

Reproduction

N/A

Environment

ROCm docker

[HaiShaw]

@kkHuang-amd for a fix.

cc. @BBuf

[HaiShaw]

Addressed in #5147