scsi: elx: libefc: Emulex FC discovery library APIs and definitions

Add library interface definitions for:

- SLI/Local FC port objects

- efc_domain_s: FC domain (aka fabric) objects

- efc_node_s: FC node (aka remote ports) objects

Link: https://lore.kernel.org/r/20210601235512.20104-10-jsmart2021@gmail.com
Reviewed-by: Daniel Wagner <dwagner@suse.de>
Co-developed-by: Ram Vegesna <ram.vegesna@broadcom.com>
Signed-off-by: Ram Vegesna <ram.vegesna@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>