meta-schemas: cell: Allow 'default' and 'uniqueItems' for common unit arrays

Properties with common unit suffixes are type of 'cell.yaml#/array'
which lists allowed property names.  'default' and 'uniqueItems' are not
there, thus property like:

  fiti,tdly-ms:
    description: example
    maxItems: 4
    items:
      enum: [0, 1, 2, 4]
    default: [0, 0, 0, 0]

was failing with:

  properties:fiti,tdly-ms: 'anyOf' conditional failed, one must be fixed:
    'items' is not one of ['maxItems', 'description', 'deprecated']
      hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
    'default' is not one of ['maxItems', 'description', 'deprecated']
      hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
    Additional properties are not allowed ('default' was unexpected)
      hint: Arrays must be described with a combination of minItems/maxItems/items
    'maxItems' is not one of ['description', 'deprecated', 'const', 'enum', 'minimum', 'maximum', 'multipleOf', 'default', '$ref', 'oneOf']
    'items' is not one of ['description', 'deprecated', 'const', 'enum', 'minimum', 'maximum', 'multipleOf', 'default', '$ref', 'oneOf']
    [0, 0, 0, 0] is not of type 'integer'
    1 was expected
      hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values.
    hint: cell array properties must define how many entries and what the entries are when there is more than one entry.
    from schema $id: http://devicetree.org/meta-schemas/cell.yaml

Add a simple test-case for that which can be used with:

  dt-doc-validate -u test/schemas test/schemas/property-units-example.yaml

Signed-off-by: Krzysztof Kozlowski <[email protected]>

Author: krzk

dtschema/meta-schemas/cell.yaml

@@ -56,8 +56,10 @@ array:
         additionalItems:
           type: boolean
           const: true
+        default: true
         description: true
         deprecated: true
+        uniqueItems: true
 
       additionalProperties: false
 

test/schemas/property-units-example.yaml

@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/property-units-example.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Test for property units
+
+maintainers:
+  - Rob Herring <[email protected]>
+
+properties:
+  vendor,property-ms:
+    description: Array property in common units
+    minItems: 1
+    maxItems: 4
+    items:
+      enum: [0, 1, 2, 4]
+    default: [0, 0, 0, 0]
+
+additionalProperties: false