ARM: S3C2416: Add Power Management support for SMDK2416

Adds suspend-to-ram support for SMDK2416 based on existing 2412 PM code

Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Sangbeom Kim <sbkim73@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>