uboot-phytec

Merge tag 'u-boot-rockchip-20200220' of https://gitlab.denx.de/u-boot/custodians/u-boot-rockchip

- rk3399: split roc-pc-rk3399 out of evb_rk3399
- sync dts from upstream kernel for rk3399,rk3288,px30
- boot_mode: find the saradc device name