ciflow/torchtitan/201352: [Inductor][AMD] Address HIP option forwarding review

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The template regression cases used only the three ordinary HIP options, so they did not detect loss of TLX-specific forwarding. Include a distinct TLX option in the mocked registry, metadata, and expected configuration. Move the forwarded HIP option names into a documented, deduplicating helper that follows the existing CUDA helper pattern. Test Plan: Four checkout regression cases passed in the prebuilt Torch 2.16/…

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