[SCSI] 53c700: remove reliance on deprecated cmnd fields

This one's quite tricky.  The 53c700 uses the now deprecated fields of
the command structure for saving the prior command when it does
autosense.  To fix this, we have to add extra fields to the LUN to
accommodate a copy of the real command.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/53c700.h

@@ -163,6 +163,8 @@ struct NCR_700_command_slot {
 	#define NCR_700_SLOT_BUSY (1|NCR_700_SLOT_MAGIC) /* slot has command active on HA */
 	#define NCR_700_SLOT_QUEUED (2|NCR_700_SLOT_MAGIC) /* slot has command to be made active on HA */
 	__u8	state;
+	#define NCR_700_FLAG_AUTOSENSE	0x01
+	__u8	flags;
 	int	tag;
 	__u32	resume_offset;
 	struct scsi_cmnd *cmnd;