MIPS: AR7: Initialize GPIO earlier

In order to detect the Titan variant, we must initialize GPIOs earlier since
detection relies on some GPIO values to be set.

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/1562/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

---
diff --git a/arch/mips/ar7/gpio.c b/arch/mips/ar7/gpio.c
index c32fbb5..f848342 100644
--- a/arch/mips/ar7/gpio.c
+++ b/arch/mips/ar7/gpio.c
@@ -107,7 +107,7 @@
 }
 EXPORT_SYMBOL(ar7_gpio_disable);
 
-static int __init ar7_gpio_init(void)
+int __init ar7_gpio_init(void)
 {
 	int ret;
 
@@ -128,4 +128,3 @@
 				ar7_gpio_chip.chip.ngpio);
 	return ret;
 }
-arch_initcall(ar7_gpio_init);