ARM: EXYNOS4: Add clkdev support

Signed-off-by: Thomas Abraham <thomas.ab@samsung.com>
[kgene.kim@samsung.com: removed changes of mach-exynos4/time.c]
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 3118228..2b5f82f 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -772,6 +772,7 @@
 	select ARCH_SPARSEMEM_ENABLE
 	select GENERIC_GPIO
 	select HAVE_CLK
+	select CLKDEV_LOOKUP
 	select ARCH_HAS_CPUFREQ
 	select GENERIC_CLOCKEVENTS
 	select HAVE_S3C_RTC if RTC_CLASS