ahci on foc_x86_32 and different qemu versions

[Taru Karttunen]

Hello

It appears that ahci is broken on foc_x86_32 with qemu 1.0, while the
same .iso works with qemu 0.14.1.

Works: Ubuntu 11.10 i386 qemu 0.14.1
Fails: Arch linux x86_64 qemu QEMU emulator version 1.0 (qemu-kvm-1.0)
Fails: Ubuntu 12.04 beta2 i386 kvm QEMU emulator version 1.0 (qemu-kvm-1.0)

All tests done with identical the same ahci.iso created originally from
run/ahci with the latest Genode git master branch.

However ahci works even on newer qemus with nova as the kernel.

- Taru Karttunen