Bug#851524: Building armhf image fwith qemu fails at bootstrapping stage if firmware section enabled

[Jason Heeris]

Forgot to mention: this looks a lot like bugs #813232 and #571136.

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=571136
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=813232

- Jason