LCD_KCAL: Color Control driver for M8

RGB Defaults are 255/255/255
Write values to sysfs /sys/devices/platform/kcal_ctrl.0/

echo "255 255 255" > /sys/devices/platform/kcal_ctrl.0/kcal
echo "1" > /sys/devices/platform/kcal_ctrl.0/kcal_ctrl

Change-Id: Ib351677b6583ffc6b34d212bc9924dc24427eabd
m8: enable LCD KCAL sysfs support

Change-Id: I873eab08a57783972add30782160ebfa34f510ee