dt-bindings: net: Add missing properties used in examples

With 'unevaluatedProperties' support implemented, the following warnings
are generated in the net bindings:

Documentation/devicetree/bindings/net/qca,ar71xx.example.dt.yaml: ethernet@19000000: Unevaluated properties are not allowed ('qca,ethcfg' was unexpected)
Documentation/devicetree/bindings/net/stm32-dwmac.example.dt.yaml: ethernet@40028000: Unevaluated properties are not allowed ('reg-names', 'snps,pbl' were unexpected)
Documentation/devicetree/bindings/net/ti,cpsw-switch.example.dt.yaml: mdio@1000: Unevaluated properties are not allowed ('clocks', 'clock-names' were unexpected)
Documentation/devicetree/bindings/net/ti,k3-am654-cpsw-nuss.example.dt.yaml: mdio@f00: Unevaluated properties are not allowed ('clocks', 'clock-names' were unexpected)

Add the missing properties/nodes as necessary.

Cc: "David S. Miller" <[email protected]>
Cc: Jakub Kicinski <[email protected]>
Cc: "Andreas Färber" <[email protected]>
Cc: Manivannan Sadhasivam <[email protected]>
Cc: Maxime Coquelin <[email protected]>
Cc: Alexandre Torgue <[email protected]>
Cc: Nobuhiro Iwamatsu <[email protected]>
Cc: Cristian Ciocaltea <[email protected]>
Cc: "G. Jaya Kumaran" <[email protected]>
Cc: Oleksij Rempel <[email protected]>
Cc: Christophe Roullier <[email protected]>
Cc: Grygorii Strashko <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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