irqchip/qcom: Use builtin_platform_driver to simplify the code

Use the builtin_platform_driver() macro to make the code simpler.
Signed-off-by: NWei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>

drivers/irqchip/qcom-irq-combiner.c

@@ -288,9 +288,4 @@ static struct platform_driver qcom_irq_combiner_probe = {
 	},
 	.probe = combiner_probe,
 };
-
-static int __init register_qcom_irq_combiner(void)
-{
-	return platform_driver_register(&qcom_irq_combiner_probe);
-}
-device_initcall(register_qcom_irq_combiner);
+builtin_platform_driver(qcom_irq_combiner_probe);