MAINTAINERS: add missing files to mm page alloc section

There are a number of files within memory management which appear to be
most suitably placed within the page allocation section of MAINTAINERS and
are otherwise unassigned, so place these there.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Lorenzo Stoakes <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
Acked-by: Brendan Jackman <[email protected]>
Acked-by: Zi Yan <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: ljskernel

MAINTAINERS

@@ -15875,8 +15875,17 @@ F:	include/linux/compaction.h
 F:	include/linux/gfp.h
 F:	include/linux/page-isolation.h
 F:	mm/compaction.c
+F:	mm/debug_page_alloc.c
+F:	mm/fail_page_alloc.c
 F:	mm/page_alloc.c
+F:	mm/page_ext.c
+F:	mm/page_frag_cache.c
 F:	mm/page_isolation.c
+F:	mm/page_owner.c
+F:	mm/page_poison.c
+F:	mm/page_reporting.c
+F:	mm/show_mem.c
+F:	mm/shuffle.c
 
 MEMORY MANAGEMENT - RECLAIM
 M:	Andrew Morton <[email protected]>