logger: Add sys fs kernel interface to configure Android logger

- now logging can be switched on and off via /sys/kernel/logger_mode/logger_mode interface
- default is 1 (on)
printk: Add sys kernel interface to configure linux printk logging

- now logging can be switched on and off via /sys/kernel/printk_mode interface
- default is 1 (on)
- Enabled time stamp information in logs again