ARM: S5PV310: Update CPUFREQ

This patch updates following of CPUFREQ.

- Updated DVFS table and divider value
- Added common function
- Added some function for changing APLL and setting

Signed-off-by: Sangwook Ju <sw.ju@samsung.com>
Reviewed-by: Jaecheol Lee <jc.lee@samsung.com>
Signed-off-by: Sangbeom Kim <sbkim73@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>