scsi: core: Show SCMD_LAST in text form

commit 3369046e upstream.

The SCSI debugfs code supports showing information about pending commands,
including translating SCSI command flags from numeric into text format.
Also convert the SCMD_LAST flag from numeric into text form.

Link: https://lore.kernel.org/r/20211129194609.3466071-4-bvanassche@acm.org
Fixes: 8930a6c2

 ("scsi: core: add support for request batching")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>