dt-bindings: socionext,uniphier-system-cache: drop minItems equal to maxItems

minItems, if missing, are implicitly equal to maxItems, so drop
redundant piece to reduce size of code.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Link: https://lore.kernel.org/r/20220825113334.196908-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/arm/socionext/socionext,uniphier-system-cache.yaml

@@ -22,7 +22,6 @@ properties:
     description: |
       should contain 3 regions: control register, revision register,
       operation register, in this order.
-    minItems: 3
     maxItems: 3
 
   interrupts: