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>