[webgpu] Only apply subgroup to intel gen-12lp #23377
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Currently, only gen-12lp is tested. And Lunar Lake is gen-13lp, which uses sg_size = 32 and the perf is bad.
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Currently, only gen-12lp is tested. And Lunar Lake is gen-13lp, which uses sg_size = 32 and the perf is bad.