MAINTAINERS: add missing mm_slot.h file THP section

This seems to be the most appropriate place for this file.

[[email protected]: also add mm_slot.h to KSM section]
  Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Lorenzo Stoakes <[email protected]>
Acked-by: Zi Yan <[email protected]>
Acked-by: Nico Pache <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Acked-by: Dev Jain <[email protected]>
Acked-by: Qi Zheng <[email protected]>
Cc: Alistair Popple <[email protected]>
Cc: Christoph Lameter (Ampere) <[email protected]>
Cc: Dave Chinner <[email protected]>
Cc: Dennis Zhou <[email protected]>
Cc: Jann Horn <[email protected]>
Cc: Liam Howlett <[email protected]>
Cc: Muchun Song <[email protected]>
Cc: Oscar Salvador <[email protected]>
Cc: Roman Gushchin <[email protected]>
Cc: Tejun Heo <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Mike Rapoport <[email protected]>
Cc: Pedro Falcato <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Cc: Shakeel Butt <[email protected]>
Cc: Joshua Hahn <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: lorenzo-stoakes

MAINTAINERS

@@ -15820,6 +15820,7 @@ F:	Documentation/mm/ksm.rst
 F:	include/linux/ksm.h
 F:	include/trace/events/ksm.h
 F:	mm/ksm.c
+F:	mm/mm_slot.h
 
 MEMORY MANAGEMENT - MEMORY POLICY AND MIGRATION
 M:	Andrew Morton <[email protected]>
@@ -15965,6 +15966,7 @@ F:	include/linux/khugepaged.h
 F:	include/trace/events/huge_memory.h
 F:	mm/huge_memory.c
 F:	mm/khugepaged.c
+F:	mm/mm_slot.h
 F:	tools/testing/selftests/mm/khugepaged.c
 F:	tools/testing/selftests/mm/split_huge_page_test.c
 F:	tools/testing/selftests/mm/transhuge-stress.c