MAINTAINERS: add mmap trace events to MEMORY MAPPING

MEMORY MAPPING does not list the mmap.h trace point file, but does list
the mmap.c file.  Couple the trace points with the users and authors of
the trace points for notifications of updates.

Link: https://lkml.kernel.org/r/20250411173328.8172-1-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Acked-by: SeongJae Park <sj@kernel.org>
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Jann Horn <jannh@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: howlett

MAINTAINERS

@@ -15562,6 +15562,7 @@ L:	linux-mm@kvack.org
 S:	Maintained
 W:	http://www.linux-mm.org
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
+F:	include/trace/events/mmap.h
 F:	mm/mlock.c
 F:	mm/mmap.c
 F:	mm/mprotect.c