dt-bindings: arm: aspeed: add Mt. Jefferson board

Document Ampere's Mt. Jefferson BMC board compatible.

Signed-off-by: Chanh Nguyen <chanh@os.amperecomputing.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20241021083702.9734-2-chanh@os.amperecomputing.com
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>

Author: chnguyen-ampere

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

@@ -74,6 +74,7 @@ properties:
       - description: AST2600 based boards
         items:
           - enum:
+              - ampere,mtjefferson-bmc
               - ampere,mtmitchell-bmc
               - aspeed,ast2600-evb
               - aspeed,ast2600-evb-a1