ARM: EXYNOS4: Add header file protection macros

This patch adds header file protection macros to prevent duplication.
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>

arch/arm/mach-exynos4/include/mach/pm-core.h

@@ -14,6 +14,10 @@
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
 */
+
+#ifndef __ASM_ARCH_PM_CORE_H
+#define __ASM_ARCH_PM_CORE_H __FILE__
+
 #include <mach/regs-pmu.h>
 
 static inline void s3c_pm_debug_init_uart(void)
@@ -57,3 +61,5 @@ static inline void samsung_pm_saved_gpios(void)
 {
 	/* nothing here yet */
 }
+
+#endif /* __ASM_ARCH_PM_CORE_H */