ARM: S5P: Make the common S5P PM code conditionally compile

Pave the way for adding PM support on S5P64X0, which is more similar
to the S3C64XX series than the S5P series. Hence, the common pm code
(containing dummy functions) should not be used for S5P64X0.

Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
diff --git a/arch/arm/mach-exynos4/Kconfig b/arch/arm/mach-exynos4/Kconfig
index 2dad16c..43ccbb0 100644
--- a/arch/arm/mach-exynos4/Kconfig
+++ b/arch/arm/mach-exynos4/Kconfig
@@ -12,11 +12,13 @@
 config CPU_EXYNOS4210
 	bool
 	select SAMSUNG_DMADEV
+	select S5P_PM if PM
 	help
 	  Enable EXYNOS4210 CPU support
 
 config SOC_EXYNOS4212
 	bool
+	select S5P_PM if PM
 	help
 	  Enable EXYNOS4212 SoC support