libata: const-ification bombing run

Enforce access rules where appropriate.

If the compiler is smart enough, this may buy us an optimization or two
as a side effect.
diff --git a/drivers/scsi/sata_mv.c b/drivers/scsi/sata_mv.c
index 9b62139..422e0b6 100644
--- a/drivers/scsi/sata_mv.c
+++ b/drivers/scsi/sata_mv.c
@@ -290,7 +290,7 @@
 	.ordered_flush		= 1,
 };
 
-static struct ata_port_operations mv_ops = {
+static const struct ata_port_operations mv_ops = {
 	.port_disable		= ata_port_disable,
 
 	.tf_load		= ata_tf_load,