osinfo: Disable unsupported VirtIO SCSI in SLES 11 for ppc64

The SLES 11 operating system does not support the VirtIO SCSI
controller, this patch disables it in the osinfo.

Change-Id: I664468106bfb76715db25289fa551436b1086a5c
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1151010
Signed-off-by: Vitor de Lima <vdelima@redhat.com>