UBI: rename struct ubi_scan_info

Rename 'struct ubi_scan_info' to 'struct ubi_attach_info'. This is part
of the code re-structuring I am trying to do in order to add fastmap
in a more logical way. Fastmap can share a lot with scanning, including
the attach-time data structures, which all now have "scan" word in the
name. Let's get rid of this word.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@linux.intel.com>
diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
index 53ef24b..12a85d5 100644
--- a/drivers/mtd/ubi/wl.c
+++ b/drivers/mtd/ubi/wl.c
@@ -1380,7 +1380,7 @@
  * This function returns zero in case of success, and a negative error code in
  * case of failure.
  */
-int ubi_wl_init_scan(struct ubi_device *ubi, struct ubi_scan_info *si)
+int ubi_wl_init_scan(struct ubi_device *ubi, struct ubi_attach_info *si)
 {
 	int err, i;
 	struct rb_node *rb1, *rb2;