touchscreen: use old drivers, old wakeup method to fix knock_on.

WARNING! This should break the "Double-tap to wake" option in ROM's Settings.
Because the location the knock_on attr has been changed from
/sys/devices/i2c-3/3-004b/knock_on
to
/sys/devices/virtual/input/lge_touch/knock_on

You should use a init.d script for enabling it on boot.

I will work for this, but not for now.