bcachefs: Rework triggers interface

The trigger for stripe keys is shortly going to need both the old and
the new key passed to the trigger - this patch does that rework.

For now, this just changes the in memory triggers, and this doesn't
change how extent triggers work.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/buckets.h

@@ -259,8 +259,8 @@ void bch2_mark_metadata_bucket(struct bch_fs *, struct bch_dev *,
 			       size_t, enum bch_data_type, unsigned,
 			       struct gc_pos, unsigned);
 
-int bch2_mark_key(struct bch_fs *, struct bkey_s_c, unsigned, s64,
-		  struct bch_fs_usage *, u64, unsigned);
+int bch2_mark_key(struct bch_fs *, struct bkey_s_c, unsigned,
+		  s64, struct bch_fs_usage *, u64, unsigned);
 int bch2_fs_usage_apply(struct bch_fs *, struct bch_fs_usage_online *,
 			struct disk_reservation *, unsigned);