usb2otg: track periodic-split state for INT/bulk transfers#807
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Add an explicit SSPLIT/CSPLIT state machine with the issuing microframe and a bounded CSPLIT NYET-retry window, and drive complete-splits and watchdog recovery from it. Stops periodic INT splits from flooding the active-too-long path and aborting transfers mid-sequence.
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Add an explicit SSPLIT/CSPLIT state machine with the issuing microframe and a bounded CSPLIT NYET-retry window, and drive complete-splits and watchdog recovery from it. Stops periodic INT splits from flooding the active-too-long path and aborting transfers mid-sequence.