platform/surface: aggregator_registry: Add DTX device

Add the detachment system (DTX) SSAM device for the Surface Book 3. This
device is accessible under the base (TC=0x11) subsystem.

Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
Link: https://lore.kernel.org/r/20210212115439.1525216-6-luzmaximilian@gmail.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>