Cubieboard2 enhancements

Improved Cubieboard2 support:
- script.bin support and fixes
- loads network module at startup
- working avahi-daemon


Perhaps the avahi-daemon doesnt belong here. I like it because it allows me to address the cubieboard by its name (e.g. ping cubieboard2.local), i.e. no need to figure out which dynamic IP it was assigned. But feel free to skip this commit if you think not generally useful.