touchpad: disable jump detection on the Lenovo X1 Gen6 touchpad

This touchpad has firmware that seems to buffer events. In the words of the reporter:

In usage, it feels like motions vary between smooth and choppy; slow movements are smooth and quick movements are choppy. It's as if the touchpad aggregates quick movements and sends one big movement instead of sending discrete events. To make the movement more natural, the events preceding the jump should be of higher magnitude and the jump less pronounced, but that's just not how the touchpad works, it seems.

In the actual event data this looks exactly like a pointer jump: small movements, one big one, then small ones again. If we filter that large movement out we prevent the user from moving quickly.

There's no way to detect this or work around this, so let's add a quirk that disables the jump detection for this device.

Fixes #506 (closed)

cc @talyz, please give this a test, thanks.