scsi: cxlflash: Convert to scsi_execute_cmd()

scsi: cxlflash: Convert to scsi_execute_cmd()

scsi_execute() is going to be removed. Convert cxlflash to use
scsi_execute_cmd().

[mkp: roll in fix for issue reported by sfr]

Signed-off-by: Mike Christie <michael.christie@oracle.com>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>