MAINTAINERS: add mm THP section

As part of the ongoing efforts to sub-divide memory management
maintainership and reviewership, establish a section for Transparent Huge
Page support and add appropriate maintainers and reviewers.

[lorenzo.stoakes@oracle.com: add Dev Jain as THP reviewer]
  Link: https://lkml.kernel.org/r/327e6f2f-0f0f-48af-9ca2-3f8cadf0d8bf@lucifer.local
Link: https://lkml.kernel.org/r/20250424111632.103637-1-lorenzo.stoakes@oracle.com
Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Acked-by: Zi Yan <ziy@nvidia.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Mariano Pache <npache@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: lorenzo-stoakes

MAINTAINERS

@@ -15587,6 +15587,30 @@ S:	Maintained
 F:	include/linux/secretmem.h
 F:	mm/secretmem.c
 
+MEMORY MANAGEMENT - THP (TRANSPARENT HUGE PAGE)
+M:	Andrew Morton <akpm@linux-foundation.org>
+M:	David Hildenbrand <david@redhat.com>
+R:	Zi Yan <ziy@nvidia.com>
+R:	Baolin Wang <baolin.wang@linux.alibaba.com>
+R:	Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
+R:	Liam R. Howlett <Liam.Howlett@oracle.com>
+R:	Nico Pache <npache@redhat.com>
+R:	Ryan Roberts <ryan.roberts@arm.com>
+R:	Dev Jain <dev.jain@arm.com>
+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:	Documentation/admin-guide/mm/transhuge.rst
+F:	include/linux/huge_mm.h
+F:	include/linux/khugepaged.h
+F:	include/trace/events/huge_memory.h
+F:	mm/huge_memory.c
+F:	mm/khugepaged.c
+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
+
 MEMORY MANAGEMENT - USERFAULTFD
 M:	Andrew Morton <akpm@linux-foundation.org>
 R:	Peter Xu <peterx@redhat.com>