unicore32: gpio: switch to gpiochip_add_data()

We're planning to remove the gpiochip_add() function to swith
to gpiochip_add_data() with NULL for data argument.

Acked-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/arch/unicore32/kernel/gpio.c b/arch/unicore32/kernel/gpio.c
index 5ab2379..49347a0 100644
--- a/arch/unicore32/kernel/gpio.c
+++ b/arch/unicore32/kernel/gpio.c
@@ -14,6 +14,8 @@
 
 #include <linux/init.h>
 #include <linux/module.h>
+#include <linux/gpio/driver.h>
+/* FIXME: needed for gpio_set_value() - convert to use descriptors or hogs */
 #include <linux/gpio.h>
 #include <mach/hardware.h>
 
@@ -118,5 +120,5 @@
  *	gpio_set_value(GPO_SET_V2, 1);
  */
 #endif
-	gpiochip_add(&puv3_gpio_chip);
+	gpiochip_add_data(&puv3_gpio_chip, NULL);
 }