LCD platform driver for beaglebone black

Driver exports sysfs interface to /sys/class/lcd/lcd16x2

For example:

This will turn lcd into digital clock

/sys/class/lcd/lcd16x2 # echo 'time' > lcdcmd

This will print "hello :)" into lcd

/sys/class/lcd/lcd16x2 # echo 'clear' > lcdcmd

/sys/class/lcd/lcd16x2 # echo 'hello :)' > lcdtext