dt-bindings: arm: aspeed: document ASRock E3C256D4I

Document ASRock E3C256D4I board compatible.
Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240502002836.17862-7-zev@bewilderbeest.netSigned-off-by: Joel Stanley <joel@jms.id.au>

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

@@ -35,6 +35,7 @@ properties:
               - ampere,mtjade-bmc
               - aspeed,ast2500-evb
               - asrock,e3c246d4i-bmc
+              - asrock,e3c256d4i-bmc
               - asrock,romed8hm3-bmc
               - asrock,spc621d8hm3-bmc
               - asrock,x570d4u-bmc