Introduces Chain lookup table/tracker and implements accessing chain
buffer using smid.  Removed link list based access of chain buffer which
requires lock and allocated as many chains needed.
Signed-off-by: Chaitra P B <chaitra.basappa@broadcom.com>
Signed-off-by: Suganath Prabu S <suganath-prabu.subramani@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>