cpufreq: 1800MHz CPU OC
cpufreq: add voltage control interfaces

Signed-off-by: Mohamed Karami <karamimed@gmail.com>
cpufreq: change voltage control interfaces to work with STweaks
cpufreq-exynos: Make the voltage interfaces step dynamic Gets rid of the hardcoded step counts in the voltage interfaces so we won't ever have to touch them again if we wish to change CPU frequency step counts. - AndreiLux