dt-bindings: net: mscc,vsc7514-switch: Simplify DSA and switch references

The mscc,vsc7514-switch schema doesn't add any custom port properties,
so it can just reference ethernet-switch.yaml#/$defs/base and
dsa.yaml#/$defs/ethernet-ports instead of the base file and can skip
defining port nodes.

Signed-off-by: Rob Herring <[e-mail]>
Acked-by: Arınç ÜNAL <[e-mail]>
Reviewed-by: Vladimir Oltean <[e-mail]>
Acked-by: Linus Walleij <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

Documentation/devicetree/bindings/net/mscc,vsc7514-switch.yaml

···
         compatible:
           const: mscc,vsc7514-switch
     then:
-      $ref: ethernet-switch.yaml#
+      $ref: ethernet-switch.yaml#/$defs/ethernet-ports
       required:
         - interrupts
         - interrupt-names
···
           minItems: 21
         reg-names:
           minItems: 21
-        ethernet-ports:
-          patternProperties:
-            "^port@[0-9a-f]+$":
-              $ref: ethernet-switch-port.yaml#
-              unevaluatedProperties: false
 
   - if:
       properties:
         compatible:
           const: mscc,vsc7512-switch
     then:
-      $ref: /schemas/net/dsa/dsa.yaml#
+      $ref: /schemas/net/dsa/dsa.yaml#/$defs/ethernet-ports
       properties:
         reg:
           maxItems: 20
         reg-names:
           maxItems: 20
-        ethernet-ports:
-          patternProperties:
-            "^port@[0-9a-f]+$":
-              $ref: /schemas/net/dsa/dsa-port.yaml#
-              unevaluatedProperties: false
 
 properties:
   compatible: