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/fs/ocfs2/super.c b/fs/ocfs2/super.c
index d33767f..0d3ed74 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -552,7 +552,7 @@
 	 */
 
 #if BITS_PER_LONG == 32
-# if defined(CONFIG_LBD)
+# if defined(CONFIG_LBDAF)
 	BUILD_BUG_ON(sizeof(sector_t) != 8);
 	/*
 	 * We might be limited by page cache size.