ARM: imx: 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: Shawn Guo <shawn.guo@linaro.org>

arch/arm/mach-imx/gpc.c

@@ -227,7 +227,7 @@ static int imx_gpc_domain_alloc(struct irq_domain *domain,
 	return irq_domain_alloc_irqs_parent(domain, irq, nr_irqs, &parent_args);
 }
 
-static struct irq_domain_ops imx_gpc_domain_ops = {
+static const struct irq_domain_ops imx_gpc_domain_ops = {
 	.xlate	= imx_gpc_domain_xlate,
 	.alloc	= imx_gpc_domain_alloc,
 	.free	= irq_domain_free_irqs_common,