ARM: SAMSUNG: Add missing include guard to gpio-core.h

Signed-off-by: NMichael Spang <spang@chromium.org>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>

arch/arm/plat-samsung/include/plat/gpio-core.h

@@ -11,6 +11,9 @@
  * published by the Free Software Foundation.
 */
 
+#ifndef __PLAT_SAMSUNG_GPIO_CORE_H
+#define __PLAT_SAMSUNG_GPIO_CORE_H
+
 #define GPIOCON_OFF	(0x00)
 #define GPIODAT_OFF	(0x04)
 
@@ -124,3 +127,5 @@ extern struct samsung_gpio_pm samsung_gpio_pm_4bit;
 /* locking wrappers to deal with multiple access to the same gpio bank */
 #define samsung_gpio_lock(_oc, _fl) spin_lock_irqsave(&(_oc)->lock, _fl)
 #define samsung_gpio_unlock(_oc, _fl) spin_unlock_irqrestore(&(_oc)->lock, _fl)
+
+#endif /* __PLAT_SAMSUNG_GPIO_CORE_H */