test: enable the required input properties on the touchpad devices

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Add an interface to enable/disable tapping.

I'm intentionally not adding a configuration interface for which tap
configures which button. IMO we should support one configuration and do that
well.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
touchpad: hook up tapping to the new config bits

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
test: add test for tap default settings

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Add a configuration interface for a bunch of settings

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