dt-bindings: arm,vexpress-juno: Add missing motherboard properties

The arm,vexpress-juno binding is missing 'ranges', 'arm,vexpress,site', and
'arm,hbi' properties. Add these and and restrict additional properties to
be nodes only.

Cc: Andre Przywara <andre.przywara@arm.com>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210819184239.1192395-3-robh@kernel.org

Documentation/devicetree/bindings/arm/arm,vexpress-juno.yaml

@@ -119,22 +119,6 @@ properties:
           - const: arm,foundation-aarch64
           - const: arm,vexpress
 
-  arm,hbi:
-    $ref: '/schemas/types.yaml#/definitions/uint32'
-    description: This indicates the ARM HBI (Hardware Board ID), this is
-      ARM's unique board model ID, visible on the PCB's silkscreen.
-
-  arm,vexpress,site:
-    description: As Versatile Express can be configured in number of physically
-      different setups, the device tree should describe platform topology.
-      For this reason the root node and main motherboard node must define this
-      property, describing the physical location of the children nodes.
-      0 means motherboard site, while 1 and 2 are daughterboard sites, and
-      0xf means "sisterboard" which is the site containing the main CPU tile.
-    $ref: '/schemas/types.yaml#/definitions/uint32'
-    minimum: 0
-    maximum: 15
-
   arm,vexpress,position:
     description: When daughterboards are stacked on one site, their position
       in the stack be be described this attribute.
@@ -185,6 +169,8 @@ patternProperties:
             const: 2
           "#size-cells":
             const: 1
+          ranges: true
+
           compatible:
             items:
               - enum:
@@ -198,8 +184,28 @@ patternProperties:
               - rs1
               - rs2
 
+          arm,hbi:
+            $ref: '/schemas/types.yaml#/definitions/uint32'
+            description: This indicates the ARM HBI (Hardware Board ID), this is
+              ARM's unique board model ID, visible on the PCB's silkscreen.
+
+          arm,vexpress,site:
+            description: As Versatile Express can be configured in number of physically
+              different setups, the device tree should describe platform topology.
+              For this reason the root node and main motherboard node must define this
+              property, describing the physical location of the children nodes.
+              0 means motherboard site, while 1 and 2 are daughterboard sites, and
+              0xf means "sisterboard" which is the site containing the main CPU tile.
+            $ref: '/schemas/types.yaml#/definitions/uint32'
+            minimum: 0
+            maximum: 15
+
         required:
           - compatible
+
+        additionalProperties:
+          type: object
+
     required:
       - compatible