conf: USB-Audio: Add C-Media USB Headphone Set to the IEC958 blacklist

[GitHub pull_request - opened <github@xxxxxxxxxxxxxxxx>]

alsa-project/alsa-lib pull request #36 was opened from tanuk:

Fixes: https://gitlab.freedesktop.org/pulseaudio/pulseaudio/issues/317

Signed-off-by: Tanu Kaskinen <tanuk@xxxxxx>

Request URL   : https://github.com/alsa-project/alsa-lib/pull/36
Patch URL     : https://github.com/alsa-project/alsa-lib/pull/36.patch
Repository URL: https://github.com/alsa-project/alsa-lib