S390: remove default cdrom, sd-card and floppy support

This patch simply disables CDROM, SD card and floppy support for the
s390 virtio machine. Without this patch, a default CDROM drive would
get added which has currently no backing on s390.

Signed-off-by: Einar Lueck <elelueck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

hw/s390-virtio.c

@@ -331,8 +331,11 @@ static QEMUMachine s390_machine = {
     .alias = "s390",
     .desc = "VirtIO based S390 machine",
     .init = s390_init,
+    .no_cdrom = 1,
+    .no_floppy = 1,
     .no_serial = 1,
     .no_parallel = 1,
+    .no_sdcard = 1,
     .use_virtcon = 1,
     .max_cpus = 255,
     .is_default = 1,