touchpad: if we have a right button, let's assume it's not a clickpad

This assumption dates back roughly a decade when INPUT_PROP_BUTTONPAD was
introduced into the kernel. To my knowledge, devices right now erroneously
advertise INPUT_PROP_BUTTONPAD when they are not a clickpad (but then they
have BTN_RIGHT) or they lack INPUT_PROP_BUTTONPAD (and only have BTN_LEFT).

So let's change our assumption here - if a clickpad has a right button log the
kernel bug and continue with the assumption the device is a touchpad with
physical buttons.

To disable that warning, fix the kernel or add an AttrInputPropDisable quirk
for the device.

Fixes #595

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

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