vhost-scsi: log control queue write descriptors

vhost-scsi: log control queue write descriptors

Log write descriptors for the control queue, leveraging
vhost_scsi_get_desc() and vhost_get_vq_desc() to retrieve the array of
write descriptors to obtain the log buffer.

For Task Management Requests, similar to the I/O queue, store the log
buffer during the submission path and log it in the completion or error
handling path.

For Asynchronous Notifications, only the submission path is involved.

Suggested-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
Message-Id: <20250403063028.16045-8-dongli.zhang@oracle.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Mike Christie <michael.christie@oracle.com>