Bug#774497: no sound on macmini G4 on wheezy

[Mathieu Malaterre <malat@debian.org>]

Package: debian-installer
Severity: important

[I am not familiar with how d-i works, so I reported the bug to d-i
package directly, feel free to re-assign if needed]

This is an attempt to fix an old bug with d-i on Mac Mini G4.
debian-installer should not blacklist snd_aoa, since it prevent user
from having sound working.

[...]
$ cat /etc/modprobe.d/blacklist.local.conf
# Local module settings
# Created by the Debian installer

blacklist snd-aoa-codec-tas
blacklist snd-aoa-fabric-layout
blacklist snd-aoa-i2sbus
blacklist snd-aoa-soundbus
blacklist snd-aoa
[...]

Ref:
https://lists.debian.org/debian-powerpc/2012/09/msg00001.html