irqchip/gic-v3-its-platform-msi: Make of_device_ids const

of_device_ids are not supposed to change at runtime. All functions
working with of_device_ids provided by <linux/of.h> work with const
of_device_ids. So mark the non-const structs as const.
Signed-off-by: NArvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>

drivers/irqchip/irq-gic-v3-its-platform-msi.c

@@ -86,7 +86,7 @@ static struct msi_domain_info its_pmsi_domain_info = {
 	.chip	= &its_pmsi_irq_chip,
 };
 
-static struct of_device_id its_device_id[] = {
+static const struct of_device_id its_device_id[] = {
 	{	.compatible	= "arm,gic-v3-its",	},
 	{},
 };