dt-bindings: Fix 'unevaluatedProperties' errors in DT graph users

In testing out under development json-schema 2020-12 support, there's a
few issues with 'unevaluatedProperties' and the graph schema. If
'graph.yaml#/properties/port' is used, then neither the port nor the
endpoint(s) can have additional properties. 'graph.yaml#/$defs/port-base'
needs to be used instead.

Cc: Sakari Ailus <[email protected]>
Cc: Mauro Carvalho Chehab <[email protected]>
Cc: "Paul J. Murphy" <[email protected]>
Cc: Daniele Alessandrelli <[email protected]>
Cc: "Niklas Söderlund" <[email protected]>
Cc: Krzysztof Kozlowski <[email protected]>
Cc: Paul Kocialkowski <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Rob Herring <[email protected]>
Reviewed-by: Niklas Söderlund <[email protected]>
Acked-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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