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/include/linux/kernel.h b/include/linux/kernel.h
index c5a71c3..fac104e 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -58,7 +58,7 @@
 #define _RET_IP_		(unsigned long)__builtin_return_address(0)
 #define _THIS_IP_  ({ __label__ __here; __here: (unsigned long)&&__here; })
 
-#ifdef CONFIG_LBD
+#ifdef CONFIG_LBDAF
 # include <asm/div64.h>
 # define sector_div(a, b) do_div(a, b)
 #else
diff --git a/include/linux/types.h b/include/linux/types.h
index 5abe354..c42724f 100644
--- a/include/linux/types.h
+++ b/include/linux/types.h
@@ -131,7 +131,7 @@
  *
  * blkcnt_t is the type of the inode's block count.
  */
-#ifdef CONFIG_LBD
+#ifdef CONFIG_LBDAF
 typedef u64 sector_t;
 typedef u64 blkcnt_t;
 #else