This reverts commit 06170671 - it turns
out that the resolution of 1 unit per mm was not correct for a number of
touch screens, causing touch sizes to be reported as way too large.
See https://crbug.com/1085648



Reported-by: Harry Cutts <hcutts@chromium.org>
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>