AMD/ROCm: update AITER repo to ROCm/aiter

[HaiShaw]

Motivation

Modifications

Checklist

• [+] Format your code according to the Code Formatting with Pre-Commit.
• [+] Add unit tests as outlined in the Running Unit Tests.
• [+] Update documentation / docstrings / example tutorials as needed, according to Writing Documentation.
• [+] Provide throughput / latency benchmark results and accuracy evaluation results as needed, according to Benchmark and Profiling and Accuracy Results.
• [+] For reviewers: If you haven't made any contributions to this PR and are only assisting with merging the main branch, please remove yourself as a co-author when merging the PR.
• [+] Please feel free to join our Slack channel at https://slack.sglang.ai to discuss your PR.