ARM: S3C64XX: 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 3f31f32..385d5c2 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -700,6 +700,7 @@
 	select CPU_V6
 	select ARM_VIC
 	select HAVE_CLK
+	select CLKDEV_LOOKUP
 	select NO_IOPORT
 	select ARCH_USES_GETTIMEOFFSET
 	select ARCH_HAS_CPUFREQ