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[CK] Fix gptoss sink ## Motivation This PR removes conditional logic for handling infinity values in the sink mechanism across multiple FMHA pipeline implementations, defaulting sink_size to 0 and adding a constraint in the kernel selection logic. ## Technical Details Changes: Removed __builtin_isinf_sign(sink_v) checks and conditional initialization of LSE accumulators across 7 pipeline files Added default initialization (= 0) for sink_size in 4 argument structs Added F_sink == "f" constraint to kernel compatibility checking ## Test Plan Local test ## Test Result passed ## Submission Checklist - [x] Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.