gpio: da8xx_gpio: Fix compiler warning

Fix below compiler warning for 64bit builds

drivers/gpio/da8xx_gpio.c: In function ‘davinci_get_gpio_bank’:
drivers/gpio/da8xx_gpio.c:446:9: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
  return (struct davinci_gpio *)addr;

Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
diff --git a/drivers/gpio/da8xx_gpio.c b/drivers/gpio/da8xx_gpio.c
index bd5a366..d28e1fa 100644
--- a/drivers/gpio/da8xx_gpio.c
+++ b/drivers/gpio/da8xx_gpio.c
@@ -434,7 +434,7 @@
 static struct davinci_gpio *davinci_get_gpio_bank(struct udevice *dev, unsigned int offset)
 {
 	struct davinci_gpio_bank *bank = dev_get_priv(dev);
-	unsigned int addr;
+	unsigned long addr;
 
 	/*
 	 * The device tree is not broken into banks but the infrastructure is