dt-bindings: i3c: dw: Add apb clock binding

Add dt binding for optional apb clock. Core clock is mandatory.

Signed-off-by: Aniket <aniketmaurya@google.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240628154526.324068-1-aniketmaurya@google.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

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

@@ -20,7 +20,16 @@ properties:
     maxItems: 1
 
   clocks:
-    maxItems: 1
+    minItems: 1
+    items:
+      - description: Core clock
+      - description: APB clock
+
+  clock-names:
+    minItems: 1
+    items:
+      - const: core
+      - const: apb
 
   interrupts:
     maxItems: 1