Fix "Unsupported Hardware" on packer/virtualbox/mac

Hello!

I read http://qiita.com/hnakamur/items/da0ed14192a18405f704

You can fix this problem by adding 'unsupported_hardware' to the ks.cfg file.
See 

https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Installation_Guide/s1-kickstart2-options.html

enjoy and thank you!

nickg