Rework the card insertion/removal detection logic:

- instead of queueing events each time the sense information changes,
  only remember that the slot needs attention
- when processing a slot needing attention, decide what to do depending upon
  its current sense information, rather than what it was when the change
  was detected
- handle the ``only one sensor asserted'' state happening during slow
  insertion or removal.

This makes the driver much more reactive to insertions and removals, and
also removes unnecessary attach/detach calls.

ok deraadt@

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