arm64: dts: broadcom: Remove SATA from Stingray

Remove SATA from Stingray as it is unsupported.

Acked-by: Ray Jui <ray.jui@broadcom.com>
Signed-off-by: Scott Branden <scott.branden@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>