HACK: register the GPIO driver earlier to ensure that gpio_request calls
from mach files succeed.

--- a/drivers/gpio/gpio-ath79.c
+++ b/drivers/gpio/gpio-ath79.c
@@ -202,4 +202,8 @@ static struct platform_driver ath79_gpio
 	.probe = ath79_gpio_probe,
 };
 
-module_platform_driver(ath79_gpio_driver);
+static int __init ath79_gpio_init(void)
+{
+	return platform_driver_register(&ath79_gpio_driver);
+}
+postcore_initcall(ath79_gpio_init);