block: rename CONFIG_LBD to CONFIG_LBDAF

Follow-up to "block: enable by default support for large devices
and files on 32-bit archs".

Rename CONFIG_LBD to CONFIG_LBDAF to:
- allow update of existing [def]configs for "default y" change
- reflect that it is used also for large files support nowadays

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/drivers/md/dm-exception-store.h b/drivers/md/dm-exception-store.h
index 0a2e6e7..c92701d 100644
--- a/drivers/md/dm-exception-store.h
+++ b/drivers/md/dm-exception-store.h
@@ -111,7 +111,7 @@
 /*
  * Funtions to manipulate consecutive chunks
  */
-#  if defined(CONFIG_LBD) || (BITS_PER_LONG == 64)
+#  if defined(CONFIG_LBDAF) || (BITS_PER_LONG == 64)
 #    define DM_CHUNK_CONSECUTIVE_BITS 8
 #    define DM_CHUNK_NUMBER_BITS 56