gpio: dw: Fix warnings about casting int to pointer

Change the type of gpio_dwabp_platdata.base from fdt_addr_t to a void
pointer, since we pass it to readl.
Signed-off-by: NSean Anderson <seanga2@gmail.com>
Reviewed-by: NLey Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: NBin Meng <bmeng.cn@gmail.com>
Reviewed-by: NSimon Glass <sjg@chromium.org>

drivers/gpio/dwapb_gpio.c

@@ -40,7 +40,7 @@ struct gpio_dwapb_platdata {
 	const char	*name;
 	int		bank;
 	int		pins;
-	fdt_addr_t	base;
+	void __iomem	*base;
 };
 
 static int dwapb_gpio_direction_input(struct udevice *dev, unsigned pin)
@@ -176,7 +176,7 @@ static int gpio_dwapb_bind(struct udevice *dev)
 		if (!plat)
 			return -ENOMEM;
 
-		plat->base = base;
+		plat->base = (void *)base;
 		plat->bank = bank;
 		plat->pins = ofnode_read_u32_default(node, "snps,nr-gpios", 0);