arm64: dts: rockchip: adjust vendor on orangepi rk3399 board

Adjust compatible string to match the board vendor of Xunlong

Signed-off-by: Tim Lunn <tim@feathertop.org>
Reviewed-by: Dragan Simic <dsimic@manjaro.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240214040731.3069111-5-tim@feathertop.org


Signed-off-by: Heiko Stuebner <heiko@sntech.de>