dt-bindings: i3c: dw: Add power-domains

Describe optional power-domains property.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/fb8adcd318b1023ca6b90d294e46ae3b59dc1280.1740490666.git.michal.simek@amd.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Author: michalsimek

Documentation/devicetree/bindings/i3c/snps,dw-i3c-master.yaml

@@ -34,6 +34,9 @@ properties:
   interrupts:
     maxItems: 1
 
+  power-domains:
+    maxItems: 1
+
 required:
   - compatible
   - reg