target: Remove cmd->se_ordered_id (unused except debug log lines)

For every command, we set se_ordered_id by doing atomic_inc_return on
dev->dev_ordered_id for the corresponding device.  However, the only
places this value gets used are in pr_debug() calls, which doesn't
seem worth an extra atomic op per IO.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --cc drivers/target/target_core_device.c
Simple merge

diff --cc drivers/target/target_core_transport.c
Simple merge

diff --cc include/target/target_core_base.h
Simple merge