Go back to defaulting to 6-byte commands for MODE SENSE,

since some drivers seem to be unhappy about the 10-byte
version. 

The subsystem configuration can override this (eg USB or
ide-scsi).

drivers/scsi/scsi_scan.c

@@ -646,7 +646,7 @@ static int scsi_add_lun(struct scsi_device *sdev, char *inq_result, int *bflags)
 	sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED;
 
 	sdev->use_10_for_rw = 1;
-	sdev->use_10_for_ms = 1;
+	sdev->use_10_for_ms = 0;
 
 	if(sdev->host->hostt->slave_configure)
 		sdev->host->hostt->slave_configure(sdev);