ARM: S5PV310: Add support RTC

This patch adds support RTC for S5PV310 and S5PC210.

Signed-off-by: Changhwan Youn <chaos.youn@samsung.com>
Signed-off-by: Jemings Ko <jemings@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index e4b74fb..83b4b08 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -733,6 +733,7 @@
 	select GENERIC_GPIO
 	select HAVE_CLK
 	select GENERIC_CLOCKEVENTS
+	select HAVE_S3C_RTC
 	help
 	  Samsung S5PV310 series based systems