Add minimal SM120 FP4 paged MQA support#55
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Extract only the paged FP4 MQA path required by sgl-project/sglang#27059 from deepseek-ai#324. The upstream feature commit 9160119 is not independently cherry-pickable because it relies on earlier SM120 JIT, MMA, and scheduler refactors, so this commit carries only the leaf support missing from sgl/dev. The supported contract is intentionally limited to next_n=1, 64 query heads, head_dim=128, block_kv=64, FP32 logits, 2-D context lengths, and no varlen indices. Dense MQA, FP8 MQA, BF16 logits, wider shape support, and SM121 family reuse are deliberately excluded.
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This PR simply cherry-picks the minimal subset of the original DeepGEMM PR deepseek-ai#324 required to enable the DeepSeek-V4 FP4 indexer on SM120. PR sgl-project/sglang#27059 builds on top of this change.