dt-bindings: display: bcm2835: add optional property power-domains

The Raspberry Pi boards with BCM283x needs control of the power domains
to get display components running. DT schema warns us that it's used, but not
documented as a optional property:

hdmi@7e902000: 'power-domains' does not match any of the regexes: ...

Signed-off-by: Stefan Wahren <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Nicolas Saenz Julienne <[e-mail]>

Documentation/devicetree/bindings/display/brcm,bcm2835-dsi0.yaml

···
   interrupts:
     maxItems: 1
 
+  power-domains:
+    maxItems: 1
+
 required:
   - "#clock-cells"
   - compatible

Documentation/devicetree/bindings/display/brcm,bcm2835-hdmi.yaml

···
   dma-names:
     const: audio-rx
 
+  power-domains:
+    maxItems: 1
+
 required:
   - compatible
   - reg

Documentation/devicetree/bindings/display/brcm,bcm2835-v3d.yaml

···
   interrupts:
     maxItems: 1
 
+  power-domains:
+    maxItems: 1
+
 required:
   - compatible
   - reg

Documentation/devicetree/bindings/display/brcm,bcm2835-vec.yaml

···
   interrupts:
     maxItems: 1
 
+  power-domains:
+    maxItems: 1
+
 required:
   - compatible
   - reg