dt-bindings: watchdog: Add support for Amlogic C3 and S4 SoCs

Update dt-binding document for watchdog of Amlogic C3 and S4 SoCs.

Signed-off-by: Huqiang Qin <huqiang.qin@amlogic.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20231027104358.342861-2-huqiang.qin@amlogic.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

Documentation/devicetree/bindings/watchdog/amlogic,meson-gxbb-wdt.yaml

@@ -15,9 +15,15 @@ allOf:
 
 properties:
   compatible:
-    enum:
-      - amlogic,meson-gxbb-wdt
-      - amlogic,t7-wdt
+    oneOf:
+      - enum:
+          - amlogic,meson-gxbb-wdt
+          - amlogic,t7-wdt
+      - items:
+          - enum:
+              - amlogic,c3-wdt
+              - amlogic,s4-wdt
+          - const: amlogic,t7-wdt
 
   reg:
     maxItems: 1