dt-bindings: arm: aspeed: add ASUS X4TF board

Document the new compatibles used on ASUS X4TF.
Signed-off-by: Kelly Hung <ppighouse@gmail.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240430045853.3894633-2-Kelly_Hung@asus.comSigned-off-by: Joel Stanley <joel@jms.id.au>

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

@@ -76,6 +76,7 @@ properties:
               - ampere,mtmitchell-bmc
               - aspeed,ast2600-evb
               - aspeed,ast2600-evb-a1
+              - asus,x4tf-bmc
               - facebook,bletchley-bmc
               - facebook,cloudripper-bmc
               - facebook,elbert-bmc