dt-bindings: dma: apple,admac: Add iommus and power-domains properties

Apple's ADMAC is on all supported Apple silicon SoCs behind an IOMMU
and has its own power-domain.

Signed-off-by: Janne Grunau <j@jannau.net>
Acked-by: Martin Povišer <povik+lin@cutebit.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Hector Martin <marcan@marcan.st>

Documentation/devicetree/bindings/dma/apple,admac.yaml

@@ -49,6 +49,13 @@ properties:
       in an interrupts-extended list the disconnected positions will contain
       an empty phandle reference <0>.
 
+  iommus:
+    minItems: 1
+    maxItems: 2
+
+  power-domains:
+    maxItems: 1
+
 required:
   - compatible
   - reg