dt-bindings: dma: pl330: Add power-domains

The pl330 DMA controller on Exynos SoC (e.g. dma-controller@3880000 in
Exynos5420) belongs to power domain, so allow such property.

Reported-by: Rob Herring <robh@kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220427064048.86635-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Vinod Koul <vkoul@kernel.org>