touchpad: set the finger pin distance to 5mm where possible

On touchpads with resolutions, use a 5mm motion threshold before we unpin the
finger (allow motion events while a clickpad button is down). This should
remove any erroneous finger movements while clicking, at the cost of having to
move the finger a bit more for a single-finger click-and-drag (use two fingers
already!)

And drop the finger drifting, it was per-event based rather than time-based.
So unless the motion threshold was hit in a single event it was possible to
move the finger around the whole touchpad without ever unpinning it.

Drop the finger drifting altogether, if the touchpad drifts by more than 5mm
we have other issues.

https://bugzilla.redhat.com/show_bug.cgi?id=1230462

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>

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