ARM: plat-iop: pass physical base for GPIO

This alters the IOP platforms to pass a physical base for their
GPIO blocks and alters the driver to remap it when probing
instead of relying on the virtual addresses to be used.

Cc: Lennert Buytenhek <kernel@wantstofly.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Mikael Pettersson <mikpe@it.uu.se>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-iop.c

@@ -110,7 +110,7 @@ static int iop3xx_gpio_probe(struct platform_device *pdev)
 	struct resource *res;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	base = (void *) res->start;
+	base = devm_ioremap_resource(&pdev->dev, res);
 
 	return gpiochip_add(&iop3xx_chip);
 }