[kernel] add fused_qk_rmsnorm_per_token_quant kernel

[gbyu-amd]

Motivation

Some quark models, e.g., amd/DeepSeek-R1-0528-MXFP4-MTP-MoEFP4 and amd/Kimi-K2-Thinking-MXFP4-AttnFP8 have fp8 weight linear layers in attn and adopt ptpc quant recipe, thus add fused_qk_rmsnorm_per_token_quant kernel in this pr which will be used in ATOM/vLLM-ATOM.

Technical Details

Test Plan

Test Result

Submission Checklist

• Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

[github-actions]

🏷️ CI Guide

Runs automatically on every PR:

• ✅ Pre-checks (submodule verification, code formatting)
• ✅ Aiter op tests (gfx942 + gfx950)
• ✅ Triton tests on MI35X (only when aiter/ops/triton/** or related paths are changed)

Extended tests (opt-in via labels):

Label	Tests
ci:triton-300x	Run an additional Triton test job on MI300X in PRs; main branch always runs both MI35X and MI300X
ci:sglang	SGLang integration tests
ci:atom	ATOM benchmark (DeepSeek-R1 + GPT-OSS)
ci:vllm	vLLM benchmark
ci:all	All of the above

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