dt-bindings: mfd: dlg,da9063: Update watchdog child node

Update watchdog child node by referring to dlg,da9062-watchdog binding
file and drop its definition from this file.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20240131102656.3379-3-biju.das.jz@bp.renesas.com
Signed-off-by: Lee Jones <lee@kernel.org>

Documentation/devicetree/bindings/mfd/dlg,da9063.yaml

@@ -35,21 +35,6 @@ properties:
   "#interrupt-cells":
     const: 2
 
-  dlg,use-sw-pm:
-    type: boolean
-    description:
-      Disable the watchdog during suspend.
-      Only use this option if you can't use the watchdog automatic suspend
-      function during a suspend (see register CONTROL_B).
-
-  watchdog:
-    type: object
-    $ref: /schemas/watchdog/watchdog.yaml#
-    unevaluatedProperties: false
-    properties:
-      compatible:
-        const: dlg,da9063-watchdog
-
   rtc:
     type: object
     $ref: /schemas/rtc/rtc.yaml#
@@ -82,6 +67,9 @@ properties:
         $ref: /schemas/regulator/regulator.yaml
         unevaluatedProperties: false
 
+  watchdog:
+    $ref: /schemas/watchdog/dlg,da9062-watchdog.yaml
+
 required:
   - compatible
   - reg