dt-bindings: arm: aspeed: add Facebook Greatlakes board

Document the new compatibles used on Facebook Greatlakes

Signed-off-by: Delphine CC Chiu <[e-mail]>
Acked-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Joel Stanley <[e-mail]>

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

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               - facebook,cloudripper-bmc
               - facebook,elbert-bmc
               - facebook,fuji-bmc
+              - facebook,greatlakes-bmc
               - ibm,everest-bmc
               - ibm,rainier-bmc
               - ibm,tacoma-bmc