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)

Signed-off-by: Dan Trifan <jimsth@gmail.com>

Conflicts:
	drivers/staging/android/Makefile
upgrade the usage of jrcu
remove printk interface
update optimizations