Based on work of David Huang https://github.com/hjc4869 Changed in the transition:
- firefly family was renamed to rk3399, which we actually never started to use. It was made for Odroid N1, which will never be sold
- adjusted compiler toolchain2 parameter
- added standard wireless drivers
- kernel config with the following changes: Docker dependencies, ZRAM, CPUfreq info, ...
- added upstream patches
- made test Ubuntu Bionic desktop and CLI Stretch build, bootlog: http://ix.io/1jVu
TBD: wifi and BT support, mainline kernel, ...
