dt-bindings: arm: aspeed: add Facebook Yosemite 4 board

Document the new compatibles used on Facebook Yosemite 4.
Signed-off-by: Delphine CC Chiu <Delphine_CC_Chiu@wiwynn.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230810070032.335161-2-Delphine_CC_Chiu@wiwynn.comSigned-off-by: Joel Stanley <joel@jms.id.au>

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

@@ -79,6 +79,7 @@ properties:
               - facebook,elbert-bmc
               - facebook,fuji-bmc
               - facebook,greatlakes-bmc
+              - facebook,yosemite4-bmc
               - ibm,everest-bmc
               - ibm,rainier-bmc
               - ibm,tacoma-bmc