arm64: dts: Add SATA DT nodes for Stingray SoC

Add DT nodes for SATA host controllers and SATA PHYs
on Stingray SoC

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