dt-bindings: net: pse-pd: ti,tps23881: Fix missing "additionalProperties" constraints

The child nodes are missing "additionalProperties" constraints which
means any undocumented properties or child nodes are allowed. Add the
constraints and all the undocumented properties exposed by the fix.

Fixes: f562202fedad ("dt-bindings: net: pse-pd: Add bindings for TPS23881 PSE controller")
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Acked-by: Kory Maincent <kory.maincent@bootlin.com>
Link: https://lore.kernel.org/r/20240523171750.2837331-1-robh@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/devicetree/bindings/net/pse-pd/ti,tps23881.yaml

@@ -29,13 +29,31 @@ properties:
       of the ports conversion matrix that establishes relationship between
       the logical ports and the physical channels.
     type: object
+    additionalProperties: false
+
+    properties:
+      "#address-cells":
+        const: 1
+
+      "#size-cells":
+        const: 0
 
     patternProperties:
       '^channel@[0-7]$':
         type: object
+        additionalProperties: false
+
+        properties:
+          reg:
+            maxItems: 1
+
         required:
           - reg
 
+    required:
+      - "#address-cells"
+      - "#size-cells"
+
 unevaluatedProperties: false
 
 required: