ARM: S5PV310: Define missing CMU register for CPUFREQ

This patch adds missing CMU(Clock Management Unit) registers for
updated S5PV310 CPUFREQ driver.

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