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 <[e-mail]>
Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

Documentation/devicetree/bindings/dma/arm,pl330.yaml

···
 
   dma-coherent: true
 
+  power-domains:
+    maxItems: 1
+
   resets:
     minItems: 1
     maxItems: 2