powerpc/cell: Use irq_of_parse_and_map() helper

static int __init spu_map_interrupts(struct spu *spu, struct device_node *np)

{

	struct of_phandle_args oirq;

	int ret;

	int i;

	for (i=0; i < 3; i++) {

		ret = of_irq_parse_one(np, i, &oirq);

		if (ret) {

			pr_debug("spu_new: failed to get irq %d\n", i);

			goto err;

		}

		ret = -EINVAL;

		pr_debug("  irq %d no 0x%x on %pOF\n", i, oirq.args[0],

			 oirq.np);

		spu->irqs[i] = irq_create_of_mapping(&oirq);

		if (!spu->irqs[i]) {

			pr_debug("spu_new: failed to map it !\n");

		spu->irqs[i] = irq_of_parse_and_map(np, i);

		if (!spu->irqs[i])

			goto err;

	}

	}

	return 0;

err:

	pr_debug("failed to map irq %x for spu %s\n", *oirq.args,

		spu->name);

	pr_debug("failed to map irq %x for spu %s\n", i, spu->name);

	for (; i >= 0; i--) {

		if (spu->irqs[i])

			irq_dispose_mapping(spu->irqs[i]);

	}

	return ret;

	return -EINVAL;

}

static int spu_map_resource(struct spu *spu, int nr,