scsi: fnic: Add stats and related functionality

Add statistics and related functionality for FDLS.

Add supporting functions to display stats.

Reviewed-by: Sesidhar Baddela <sebaddel@cisco.com>
Reviewed-by: Arulprabhu Ponnusamy <arulponn@cisco.com>
Reviewed-by: Gian Carlo Boffa <gcboffa@cisco.com>
Signed-off-by: Karan Tilak Kumar <kartilak@cisco.com>
Link: https://lore.kernel.org/r/20241212020312.4786-13-kartilak@cisco.com


Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>