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
@@ -322,4 +322,8 @@ static struct platform_driver ath79_gpio
 	.remove = ath79_gpio_remove,
 };
 
-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);