test: mark the protocol A device as touch device

Now that we're emulating everything correctly, let's mark it as proper touch
device.

Two test cases need to be excluded:
- double-down triggers an assert in the test device because this isn't
  possible this way with protocol A devices
- the axisrange warning test can't be triggered, mtdev clips those axes

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