libfcoe, fcoe: consolidate the fcoe_ctlr_get_lesb/fcoe_get_lesb

Similarly they can be moved into libfcoe instead of being private to fcoe now.
Also add comments particularly on the term LESB to the corresponding function.

Signed-off-by: Yi Zou <yi.zou@intel.com>
Cc: Bhanu Prakash Gollapudi <bprakash@broadcom.com>
Tested-by: Marcus Dennis <marcusx.e.dennis@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
diff --git a/include/scsi/libfcoe.h b/include/scsi/libfcoe.h
index 6c59ba7..4427393 100644
--- a/include/scsi/libfcoe.h
+++ b/include/scsi/libfcoe.h
@@ -261,6 +261,8 @@
 void fcoe_wwn_to_str(u64 wwn, char *buf, int len);
 int fcoe_validate_vport_create(struct fc_vport *vport);
 int fcoe_link_speed_update(struct fc_lport *);
+void fcoe_get_lesb(struct fc_lport *, struct fc_els_lesb *);
+void fcoe_ctlr_get_lesb(struct fcoe_ctlr_device *ctlr_dev);
 
 /**
  * is_fip_mode() - returns true if FIP mode selected.