touchpad: mark ALPS touchpads for middle button emulation

touchpad: mark ALPS touchpads for middle button emulation

Alps devices don't know if there is a physical middle button on the touchpad,
so they always report one.
Since a large number of touchpads only have two buttons, enable middle button
emulation by default. Those that really don't want it can play with
configuration options, everyone else has it working by default.

The hwdb entry uses "*Alps ..*" as name to also trigger the "litest Alps..."
devices.

https://bugzilla.redhat.com/show_bug.cgi?id=1227992

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