dt-bindings: arm: aspeed: add Asrock X570D4U board

Document Asrock X570D4U compatible.
Signed-off-by: Renze Nicolai <renze@rnplus.nl>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20231202003908.3635695-2-renze@rnplus.nlSigned-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>

Documentation/devicetree/bindings/arm/aspeed/aspeed.yaml

@@ -37,6 +37,7 @@ properties:
               - asrock,e3c246d4i-bmc
               - asrock,romed8hm3-bmc
               - asrock,spc621d8hm3-bmc
+              - asrock,x570d4u-bmc
               - bytedance,g220a-bmc
               - facebook,cmm-bmc
               - facebook,minipack-bmc