MAINTAINERS: add include/block/aio-wait.h

The include/block/aio-wait.h header file was added by commit
7719f3c9 ("block: extract
AIO_WAIT_WHILE() from BlockDriverState") without updating MAINTAINERS.
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Message-id: 20180312132204.23683-1-stefanha@redhat.com
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>

MAINTAINERS

@@ -1351,6 +1351,7 @@ F: util/aio-*.c
 F: block/io.c
 F: migration/block*
 F: include/block/aio.h
+F: include/block/aio-wait.h
 F: scripts/qemugdb/aio.py
 T: git git://github.com/stefanha/qemu.git block