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fix: match LayerNorm autocast policy - #263
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背景
LayerNorm autograd function 注册的 op 名是
LayerNormFunction，autocast 去掉Function后缀后实际查找的是LayerNorm。但 cast policy 表里写成了Layernorm，导致预期的 FP32 autocast policy 没有匹配成功，BF16 输入仍保持 BF16。在 BF16 训练路径中，这会暴露 dtype 不一致问题，尤其是相邻 Linear backward kernel 会将梯度提升为 FP32 的场景。
修改内容
Layernorm修正为LayerNorm。device.hinclude。