[U-Boot] rockchip: dts: rk3229: add dwc2 node for fastboot

[Philipp Tomsich]

> Add dwc2 node for fastboot to init dwc2 controller.
> 
> Signed-off-by: Meng Dongyang <daniel.meng at rock-chips.com>
> Acked-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
> ---
>  arch/arm/dts/rk3229-evb.dts |  4 ++++
>  arch/arm/dts/rk322x.dtsi    | 10 ++++++++++
>  2 files changed, 14 insertions(+)
> 

Reviewed-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>