Merge tag 'u-boot-rockchip-20201113' of https://gitlab.denx.de/u-boot/custodians/u-boot-rockchip

- Fix USB support for rk3399 Pinebook Pro;
- Fix SPI boot for rk3399 boards other than Bob;
- Fix 32bit boards firmware build without SPL_OPTEE support;
- Fix rockchip display driver license;