dt-bindings: net: dsa: Drop 'ethernet-ports' node properties

Constraints on 'ethernet-ports' node properties are already defined by the
reference to ethernet-switch.yaml, so they can be dropped from the DSA
schema.

Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20231016-dt-net-cleanups-v1-8-a525a090b444@kernel.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>