ARM: 8346/1: sa1100: Constify irq_domain_ops

The irq_domain_ops are not modified by the driver and the irqdomain core
code accepts pointer to a const data.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-sa1100/irq.c

@@ -73,7 +73,7 @@ static int sa1100_normal_irqdomain_map(struct irq_domain *d,
 	return 0;
 }
 
-static struct irq_domain_ops sa1100_normal_irqdomain_ops = {
+static const struct irq_domain_ops sa1100_normal_irqdomain_ops = {
 	.map = sa1100_normal_irqdomain_map,
 	.xlate = irq_domain_xlate_onetwocell,
 };