scsi: mpi3mr: Declare SCSI host template const

Make it explicit that the SCSI host template is not modified.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20230322195515.1267197-54-bvanassche@acm.orgSigned-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/mpi3mr/mpi3mr_os.c

@@ -4757,7 +4757,7 @@ static int mpi3mr_qcmd(struct Scsi_Host *shost,
 	return retval;
 }
 
-static struct scsi_host_template mpi3mr_driver_template = {
+static const struct scsi_host_template mpi3mr_driver_template = {
 	.module				= THIS_MODULE,
 	.name				= "MPI3 Storage Controller",
 	.proc_name			= MPI3MR_DRIVER_NAME,