ARM: OMAP2+: 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: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/omap-wakeupgen.c

@@ -444,7 +444,7 @@ static int wakeupgen_domain_alloc(struct irq_domain *domain,
 	return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &parent_args);
 }
 
-static struct irq_domain_ops wakeupgen_domain_ops = {
+static const struct irq_domain_ops wakeupgen_domain_ops = {
 	.xlate	= wakeupgen_domain_xlate,
 	.alloc	= wakeupgen_domain_alloc,
 	.free	= irq_domain_free_irqs_common,