[U-Boot] [U-Boot, 2/3] rockchip: rv1108: add adc key dt node for evb_rv1108

[Philipp Tomsich]

> RV1108 EVB uses a adc-based recovery(VOL+) key, which
> connected to saradc channel 0.
> This patch add dt node for it.
> 
> Signed-off-by: Andy Yan <andy.yan at rock-chips.com>
> ---
> 
>  arch/arm/dts/rv1108-evb.dts | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 

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