kernel: completion-event hints and GSP-RM state introspection

- re-post the completion event for a bounded window after a channel
  completes work (notifier consumed or semaphore release applied), so a
  client that starts waiting after the edge-triggered wake-up still gets
  a wake-up; the OS event classes carry no source object, so the hint
  broadcasts to the registered events
- add rmstate (dump msgq cursors, guest consumption position, event
  table) and rmpost (post an event record by index or to all) debug
  parameters, both executing in kthreads because the IOMMU read path
  only works with a NULL current->mm or the mapping owner's mm
- report the underlying error codes from the event post path

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