dt-bindings: memory-controllers: reference TI GPMC peripheral properties

Reference the Texas Instruments GPMC Bus Child Nodes schema with
peripheral properties, in common Memory Controller bus
Peripheral-specific schema, to allow properly validate devices like
davicom,dm9000.
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230713152848.82752-3-krzysztof.kozlowski@linaro.orgSigned-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Documentation/devicetree/bindings/memory-controllers/mc-peripheral-props.yaml

@@ -36,5 +36,6 @@ allOf:
   - $ref: st,stm32-fmc2-ebi-props.yaml#
   - $ref: ingenic,nemc-peripherals.yaml#
   - $ref: intel,ixp4xx-expansion-peripheral-props.yaml#
+  - $ref: ti,gpmc-child.yaml#
 
 additionalProperties: true