dt-bindings: mfd: qnap,ts433-mcu: Allow nvmem-layout child node

The MCU has an eeprom memory connected internally, that for example
contains some mac-addresses for the soc gmac controllers.

Therefore allow defining the nvmem-layout for the eeprom.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: "Rob Herring (Arm)" <robh@kernel.org>
Link: https://lore.kernel.org/r/20250730172248.1875122-2-heiko@sntech.de
Signed-off-by: Lee Jones <lee@kernel.org>
diff --git a/Documentation/devicetree/bindings/mfd/qnap,ts433-mcu.yaml b/Documentation/devicetree/bindings/mfd/qnap,ts433-mcu.yaml
index fe9e06c..5454d94 100644
--- a/Documentation/devicetree/bindings/mfd/qnap,ts433-mcu.yaml
+++ b/Documentation/devicetree/bindings/mfd/qnap,ts433-mcu.yaml
@@ -19,6 +19,9 @@
       - qnap,ts233-mcu
       - qnap,ts433-mcu
 
+  nvmem-layout:
+    $ref: /schemas/nvmem/layouts/nvmem-layout.yaml
+
 patternProperties:
   "^fan-[0-9]+$":
     $ref: /schemas/hwmon/fan-common.yaml#