lpfc 8.3.20: Update lpfc to revision 8.3.20

This patch set updates the lpfc driver to revision 8.3.20

The patches for 8.3.20 contain:
- Critical fixes.
- Implement the FC and SLI async event handlers.
- Implement new SLI4 init procedures based on if_type
- Updates to FC discovery commands
- Update lpfc driver version to 8.3.20

The bugfixes were cut against scsi-misc-2.6

-- james s