Merge tag 'rockchip-for-v2019.07-rc3' of git://git.denx.de/u-boot-rockchip

- some fix for rk3399-puma;
- rockchip script make_fit_atf.py cleanup
- Enable TPL for rk3399 orangepi and nanopi4;
- add support for rk3399 boards: Nanopi NEO4, Rockpro64, Rock PI 4;