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As all level 2 and level 3 caches are unified, add required
cache-unified properties to fix warnings like:

  alpine-v3-evp.dtb: cache@0: 'cache-unified' is a dependency of 'cache-size'

Link: https://lore.kernel.org/r/20230421223141.115072-1-krzysztof.kozlowski@linaro.org

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>