md: remove unnecesary md_new_event_inintr

md_new_event had removed sysfs_notify since 'commit 72a23c21
("Make sure all changes to md/sync_action are notified.")', so we
can use md_new_event and delete md_new_event_inintr.

Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: NeilBrown <neilb@suse.com>