fix memory allocation problems and collateral damage:

o create a separate tag for each object allocated with bus_dmamem_alloc so
  the tag's maxsize is setup appropriately; this reduces memory allocation
  for the queue descriptors from 16M to what it should be and also fixes
  memory allocation for public key operands
o release bus dma resources on detach so module usage doesn't leak
o remove public key op disable now that bus dma memory allocation is fixed
o collect attach error handling in one place

Sponsored by:	Vernier Networks

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