[SCSI] Add scsi_dev_info_list_del_keyed()

For scsi_dh.c to use devinfo lists, we have to be able to remove entries
before rmmod.

Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h
index b4056d1..ce9e0ad 100644
--- a/drivers/scsi/scsi_priv.h
+++ b/drivers/scsi/scsi_priv.h
@@ -56,6 +56,7 @@
 extern int scsi_dev_info_list_add_keyed(int compatible, char *vendor,
 					char *model, char *strflags,
 					int flags, int key);
+extern int scsi_dev_info_list_del_keyed(char *vendor, char *model, int key);
 extern int scsi_dev_info_add_list(int key, const char *name);
 extern int scsi_dev_info_remove_list(int key);