Try to mitigate potential future driver core api changes by adding a padding to struct scsi_cmnd, struct scsi_device, and struct scsi_host_template. Based on a change made to the RHEL/CENTOS 8 kernel. Bug: 151154716 Signed-off-by: Greg Kroah-Hartman <gregkh@google.com> Change-Id: Ie6a2b91970e8f9063bf00e96a0dff661f77b8e8d