soc: ti: knav_qmss: Constify struct knav_range_ops

'struct knav_range_ops' is not modified in these drivers.

Constifying this structure moves some data to a read-only section, so
increase overall security.

On a x86_64, with allmodconfig:
Before:
======
text data bss dec hex filename
7498 1193 0 8691 21f3 drivers/soc/ti/knav_qmss_acc.o

After:
=====
text data bss dec hex filename
7566 1145 0 8711 2207 drivers/soc/ti/knav_qmss_acc.o

Signed-off-by: Christophe JAILLET <[e-mail]>
Link: https://lore.kernel.org/r/a8b4b428f9[e-mail]
Signed-off-by: Nishanth Menon <[e-mail]>

drivers/soc/ti/knav_qmss.h

···
 	void				*queue_base_inst;
 	unsigned			flags;
 	struct list_head		list;
-	struct knav_range_ops		*ops;
+	const struct knav_range_ops	*ops;
 	struct knav_acc_info		acc_info;
 	struct knav_acc_channel	*acc;
 	unsigned			num_irqs;

drivers/soc/ti/knav_qmss_acc.c

···
 	return 0;
 }
 
-static struct knav_range_ops knav_acc_range_ops = {
+static const struct knav_range_ops knav_acc_range_ops = {
 	.set_notify	= knav_acc_set_notify,
 	.init_queue	= knav_acc_init_queue,
 	.open_queue	= knav_acc_open_queue,

drivers/soc/ti/knav_qmss_queue.c

···
 	return 0;
 }
 
-static struct knav_range_ops knav_gp_range_ops = {
+static const struct knav_range_ops knav_gp_range_ops = {
 	.set_notify	= knav_gp_set_notify,
 	.open_queue	= knav_gp_open_queue,
 	.close_queue	= knav_gp_close_queue,