[VBFS] rearrange code flows

[How to use]
- set vbfs governor
 echo "vbfs" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

- set ondemand governor
 echo "ondemand" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

- write logs on /data/cpulog/cpulog2.txt
 echo # > /sys/devices/system/cpu/cpu0/cpufreq/status_monitor

- enable kernel logs
 echo 1 > /sys/devices/system/cpu/cpufreq/vbfs/debug

- disable kernel logs
 echo 0 > /sys/devices/system/cpu/cpufreq/vbfs/debug