ARM: EXYNOS: Add Clock register list for save and restore

This patch adds clock register list for save and restore. When system
enter suspend mode and wakeup from suspend mode, All clock register is
reset.  So critical register should be saved and reset.

Signed-off-by: Jongpill Lee <boyko.lee@samsung.com>
[kgene.kim@samsung.com: re-worked on top of v3.4-rc7]
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>