ARM: EXYNOS4: Fix compilation break

The patch "ARM: SAMSUNG: Add support for pre-sleep/post-restore gpio
control" broke compilation on Exynos4 platform with power management
enabled. This patch adds missing stubs that fixes this issue.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

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

@@ -47,3 +47,13 @@ static inline void s3c_pm_arch_update_uart(void __iomem *regs,
 {
 	/* nothing here yet */
 }
+
+static inline void s3c_pm_restored_gpios(void)
+{
+	/* nothing here yet */
+}
+
+static inline void s3c_pm_saved_gpios(void)
+{
+	/* nothing here yet */
+}