scsi: fnic: Remove extern definition from .c files

scsi: fnic: Remove extern definition from .c files

Implement review comments from Martin:
    Remove extern definition of fnic_fip_queue from .c files

Reviewed-by: Sesidhar Baddela <sebaddel@cisco.com>
Reviewed-by: Arulprabhu Ponnusamy <arulponn@cisco.com>
Reviewed-by: Gian Carlo Boffa <gcboffa@cisco.com>
Reviewed-by: Arun Easi <aeasi@cisco.com>
Signed-off-by: Karan Tilak Kumar <kartilak@cisco.com>
Link: https://lore.kernel.org/r/20250106224451.3597-2-kartilak@cisco.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>