Now that we are using shared firmware in coral, we need to port the model.dtsi changes over to reef-uni so that:
* reef, electro and basking share the same firmware (do we need new models for these?)
* sand is sharing libpayload reef config and so might also benefit from using the shares phandle: http://cs/chromeos_internal/src/private-overlays/overlay-reef-private/chromeos-base/chromeos-config-bsp/files/model.dtsi?l=59&rcl=a9ffa906b70a7b449676cb611a7bb306e3d1ca48