Merge tag 'u-boot-rockchip-20200722' of https://gitlab.denx.de/u-boot/custodians/u-boot-rockchip

- New rk3326 board: Hardkernel Odroid Go2;
- Update board config and dts for RockPI 4/N8/N10;
- Update led boot on support for roc-rk3399-pc;
- Enable SPI Flash suppor for rk3328 rock64 board;
- Update rockchip pcie phy to use generic framework;