gpio: s5p: call: dev_get_addr() instead of fdtdec_get_addr()

After rework in lib/fdtdec.c, the function fdtdec_get_addr()
doesn't work for nodes with #size-cells property set to 0.

To get GPIO's 'reg' property, the code should use one of:
fdtdec_get_addr_size_auto_no/parent() function.

Fortunately dm core provides a function to get the property.

This commit reworks function gpio_exynos_bind(), to properly
use dev_get_addr() for GPIO device.

This prevents setting a wrong base register for Exynos GPIOs.

Tested on: Odroid U3/X2, Trats, Trats2, Odroid XU3, Snow (by Simon).

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>

drivers/gpio/s5p_gpio.c

@@ -341,18 +341,22 @@ static int gpio_exynos_bind(struct udevice *parent)
 		plat = calloc(1, sizeof(*plat));
 		if (!plat)
 			return -ENOMEM;
-		reg = fdtdec_get_addr(blob, node, "reg");
-		if (reg != FDT_ADDR_T_NONE)
-			bank = (struct s5p_gpio_bank *)((ulong)base + reg);
-		plat->bank = bank;
-		plat->bank_name = fdt_get_name(blob, node, NULL);
-		debug("dev at %p: %s\n", bank, plat->bank_name);
 
+		plat->bank_name = fdt_get_name(blob, node, NULL);
 		ret = device_bind(parent, parent->driver,
-					plat->bank_name, plat, -1, &dev);
+				  plat->bank_name, plat, -1, &dev);
 		if (ret)
 			return ret;
+
 		dev->of_offset = node;
+
+		reg = dev_get_addr(dev);
+		if (reg != FDT_ADDR_T_NONE)
+			bank = (struct s5p_gpio_bank *)((ulong)base + reg);
+
+		plat->bank = bank;
+
+		debug("dev at %p: %s\n", bank, plat->bank_name);
 	}
 
 	return 0;