ARM: S5P64X0: Add clkdev support

Signed-off-by: Thomas Abraham <thomas.ab@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 385d5c2..5635b87 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -725,6 +725,7 @@
 	select CPU_V6
 	select GENERIC_GPIO
 	select HAVE_CLK
+	select CLKDEV_LOOKUP
 	select HAVE_S3C2410_WATCHDOG if WATCHDOG
 	select GENERIC_CLOCKEVENTS
 	select HAVE_SCHED_CLOCK