ext4: add batched_discard into ext4 feature list

Should be applied on the top of "lazy inode table initialization"
and "batched discard support" patch-sets.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

fs/ext4/super.c

@@ -2457,9 +2457,11 @@ static struct attribute *ext4_attrs[] = {
 
 /* Features this copy of ext4 supports */
 EXT4_INFO_ATTR(lazy_itable_init);
+EXT4_INFO_ATTR(batched_discard);
 
 static struct attribute *ext4_feat_attrs[] = {
 	ATTR_LIST(lazy_itable_init),
+	ATTR_LIST(batched_discard),
 	NULL,
 };