gpio: mvebu: use generic device properties

OF-specific routines should not be used unless necessary. Generic device
properties are preferred so switch to using them in the driver code.

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Bartosz Golaszewski <[e-mail]>

drivers/gpio/gpio-mvebu.c

···
 	u32 set;
 
 	if (mvchip->soc_variant == MVEBU_GPIO_SOC_VARIANT_A8K) {
-		int ret = of_property_read_u32(dev->of_node,
-					       "marvell,pwm-offset", &offset);
+		int ret = device_property_read_u32(dev, "marvell,pwm-offset",
+						   &offset);
 		if (ret < 0)
 			return 0;
 	} else {
···
 	if (IS_ERR(mvchip->regs))
 		return PTR_ERR(mvchip->regs);
 
-	if (of_property_read_u32(pdev->dev.of_node, "offset", &mvchip->offset))
+	if (device_property_read_u32(&pdev->dev, "offset", &mvchip->offset))
 		return -EINVAL;
 
 	return 0;
···
 
 	platform_set_drvdata(pdev, mvchip);
 
-	if (of_property_read_u32(pdev->dev.of_node, "ngpios", &ngpios)) {
+	if (device_property_read_u32(&pdev->dev, "ngpios", &ngpios)) {
 		dev_err(&pdev->dev, "Missing ngpios OF property\n");
 		return -ENODEV;
 	}