Add support for the absolute coordinates mode. This is needed to support
multitouch touchscreens, instead of touchpad's where this driver was intended
for. This is working perfectly on my sabreLite iMX6 board with a Nit6X
multitouch touchscreen. All the mulitouch events are still worlking properly.
Remark: There is no scaling on the absolute input coordinates so both
resolutions should match.