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.com


Signed-off-by: Joel Stanley <joel@jms.id.au>