ARM: S5PV210: Add Register definition for CMU

This patch adds some CMU(Clock Management Unit) registers for
supporting CPUFREQ and some drivers.

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