Add some AITER kernel routing for ROCm#46268
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Routes ROCm to AITER Triton kernels on AMD GPUs:
rotary_pos_emb→kernels-community/aiter-ropeflash_attention_3→kernels-community/aiter-flash-attnWaiting on kernels-community PR #890 so the
aiter-flash-attnHub artifact ships its per-arch MHA autotune configs (without it, the kernel raisesFileNotFoundErroron first call).Longer-term goal: ship the full AITER in Kernels (same model as
liger-kernels) rather than one repo per kernel. We're starting withaiter-ropeandaiter-flash-attnbecause those are the two we need in transformers right now.