dma: expose GPU linked-list observability - #317
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Add passive DMA2 ordering-table counters to dma_state so long or aborted linked-list walks are visible without relying on screenshots. The counters track starts, duplicate starts dropped while a walk is active, completions, cancels, last/max walk size and cycle cost, CHCR poll counts, the initiator PC, and the last eight cancel records. This intentionally does not port PR #302's superseded walker changes or the PSX_GPU_LL_SYNC diagnostic lever; PR #304 remains the timing implementation. Co-authored-by: Kevin Kline <9866117+kerokline@users.noreply.github.com>
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Summary
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Context: salvages the counters-only part called out in #302 (comment) after #304 superseded the walker fix.