Add an empty calibration file to prevent the 'xinput_calibrator' tool
being launched on X11 desktop start.
The file does not have any calibration data because capacitive touch
displays usually do not need calibration.
https://jira.digi.com/browse/DEL-3046
Signed-off-by: Javier Viguera <javier.viguera@digi.com>
Javier Viguera