[U-Boot] [U-Boot, 1/3] rockchip: add u-boot specific dts for rk3368 based boards

[Philipp Tomsich]

> Device drivers like debug serial, dmc should be enabled before
> relocation, so add u-boot.dtsi files to contain devices that
> should be marked as dm-pre-reloc.
> 
> Signed-off-by: Andy Yan <andy.yan at rock-chips.com>
> ---
> 
>  arch/arm/dts/rk3368-geekbox-u-boot.dtsi | 35 +++++++++++++++++++++++++++++++++
>  arch/arm/dts/rk3368-px5-evb-u-boot.dtsi | 35 +++++++++++++++++++++++++++++++++
>  arch/arm/dts/rk3368-sheep-u-boot.dtsi   | 35 +++++++++++++++++++++++++++++++++
>  3 files changed, 105 insertions(+)
>  create mode 100644 arch/arm/dts/rk3368-geekbox-u-boot.dtsi
>  create mode 100644 arch/arm/dts/rk3368-px5-evb-u-boot.dtsi
>  create mode 100644 arch/arm/dts/rk3368-sheep-u-boot.dtsi
> 

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