dt-bindings: usb: usb-switch: Allow data-lanes property in port

The ref /schemas/graph.yaml#/properties/port forbids extra properties
which might be specified in subschemas, e.g. like in
usb/fcs,fsa4480.yaml.

Switch to port-base (and specify the endpoint with properties) to allow
such properties.

Fixes: fd2a052c ("dt-bindings: usb: add common Type-C USB Switch schema")
Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
Link: https://lore.kernel.org/r/20250425-fp5-pmic-glink-dp-v3-1-cc9c2aeb42fb@fairphone.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>