dt-bindings: media: Add missing clock domain description

make dtbs_check:

    arch/arm/boot/dts/r7s72100-genmai.dt.yaml: camera@e8210000: 'clocks', 'power-domains' do not match any of the regexes: 'pinctrl-[0-9]+'

Fix this by documenting the missing properties.
Update the example to match reality.

Fixes: 58361eaa11 ("dt-bindings: media: renesas,ceu: Convert to yaml")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/media/renesas,ceu.yaml

@@ -27,6 +27,12 @@ properties:
   interrupts:
     maxItems: 1
 
+  clocks:
+    maxItems: 1
+
+  power-domains:
+    maxItems: 1
+
   port:
     type: object
     additionalProperties: false
@@ -57,6 +63,8 @@ required:
   - compatible
   - reg
   - interrupts
+  - clocks
+  - power-domains
   - port
 
 additionalProperties: false
@@ -64,11 +72,14 @@ additionalProperties: false
 examples:
   - |
     #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/r7s72100-clock.h>
 
     ceu: ceu@e8210000 {
         reg = <0xe8210000 0x209c>;
         compatible = "renesas,r7s72100-ceu";
         interrupts = <GIC_SPI 332 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&mstp6_clks R7S72100_CLK_CEU>;
+        power-domains = <&cpg_clocks>;
 
         port {
             ceu_in: endpoint {