- Based on https://github.com/anupcshan/gokrazy-odroidxu4-kernel/
- Build functioning u-boot-rockchip.bin
- Generate basic kernel and clean up XU4 files
- Rename vmlinux -> vmlinuz to make Gokrazy plumbing easier
- Enable squashfs root config
- Enable STMMAC - network works, but eth has the same MAC address for all devices :\
- Enable other Rockchip config entities
- Fix setexpr string termination
