qemu: command: Make vhost-scsi device string depend on address

The vhost-scsi device string should depend on the requested
address type, not strictly on the emulated arch. This is the
same logic used by qemuBuildVirtioDevStr, and this particular
path is already tested in the hostdev-scsi-vhost-scsi-ccw tests
Reviewed-by: NAndrea Bolognani <abologna@redhat.com>
Signed-off-by: NCole Robinson <crobinso@redhat.com>

src/qemu/qemu_command.c

@@ -4925,7 +4925,7 @@ qemuBuildSCSIVHostHostdevDevStr(const virDomainDef *def,
         goto cleanup;
     }
 
-    if (ARCH_IS_S390(def->os.arch))
+    if (dev->info->type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_CCW)
         virBufferAddLit(&buf, "vhost-scsi-ccw");
     else
         virBufferAddLit(&buf, "vhost-scsi-pci");