ARM: dts: Set up power domain for MFC and G-scaler for exynos5250

This patch adds device tree nodes for MFC and G-scaler power
domains of exynos5250.It binds these power-domain nodes to repsective
device tree nodes

It also adds support to enable PM generic domains for exynos5250.

Signed-off-by: Prasanna Kumar <prasanna.ps@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
index 78bd347..66b12f7 100644
--- a/arch/arm/mach-exynos/Kconfig
+++ b/arch/arm/mach-exynos/Kconfig
@@ -61,6 +61,7 @@
 	bool "SAMSUNG EXYNOS5250"
 	default y
 	depends on ARCH_EXYNOS5
+	select PM_GENERIC_DOMAINS if PM
 	select S5P_PM if PM
 	select S5P_SLEEP if PM
 	select S5P_DEV_MFC