linux-phytec-fsl

Documentation: devicetree: rockchip: Document rk3368-GeekBox

Use "geekbuying,geekbox" compatible string.

Signed-off-by: Andreas Färber <afaerber@suse.de>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>