dt-bindings: example: Extend with typical case (int-array and disallowed prop)

Extend the example with:
 - an array where each element has constraints (min/max value),
 - property not allowed in case of different compatible.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220223073547.8746-2-krzysztof.kozlowski@canonical.com