MAINTAINERS: add Stefan Hajnoczi to IDE maintainers

Make Stefan officially co-maintain hw/ide/ with Kevin.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Acked-by: Kevin Wolf <kwolf@redhat.com>

MAINTAINERS

@@ -563,6 +563,7 @@ Devices
 -------
 IDE
 M: Kevin Wolf <kwolf@redhat.com>
+M: Stefan Hajnoczi <stefanha@redhat.com>
 S: Odd Fixes
 F: include/hw/ide.h
 F: hw/ide/