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/Documentation/SubmitChecklist b/Documentation/SubmitChecklist
index ac5e0b2..78a9168 100644
--- a/Documentation/SubmitChecklist
+++ b/Documentation/SubmitChecklist
@@ -54,7 +54,7 @@
     CONFIG_PREEMPT.
 
 14: If the patch affects IO/Disk, etc: has been tested with and without
-    CONFIG_LBD.
+    CONFIG_LBDAF.
 
 15: All codepaths have been exercised with all lockdep features enabled.