MAINTAINERS: add Jann Horn as rmap reviewer

Jann has been an excellent contributor in all areas of memory management,
and has demonstrated great expertise in the reverse mapping.

It's therefore appropriate for him to become a reviewer.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Lorenzo Stoakes <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Acked-by: Harry Yoo <[email protected]>
Acked-by: SeongJae Park <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
Acked-by: Liam R. Howlett <[email protected]>
Cc: Jann Horn <[email protected]>
Cc: Rik van Riel <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: ljskernel

MAINTAINERS

@@ -16195,6 +16195,7 @@ R:	Rik van Riel <[email protected]>
 R:	Liam R. Howlett <[email protected]>
 R:	Vlastimil Babka <[email protected]>
 R:	Harry Yoo <[email protected]>
+R:	Jann Horn <[email protected]>
 L:	[email protected]
 S:	Maintained
 F:	include/linux/rmap.h