MAINTAINERS: add Lorenzo as THP co-maintainer

I am doing a great deal of review and getting ever more involved in THP
with intent to do more so in future also, so add myself as co-maintainer
to help David with workload.

Link: https://lkml.kernel.org/r/20250625095231.42874-1-lorenzo.stoakes@oracle.com
Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Acked-by: Dev Jain <dev.jain@arm.com>
Acked-by: Zi Yan <ziy@nvidia.com>
Acked-by: Oscar Salvador <osalvador@suse.de>
Cc: Barry Song <baohua@kernel.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Mariano Pache <npache@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: ljskernel

MAINTAINERS

@@ -15945,9 +15945,9 @@ F:	mm/swapfile.c
 MEMORY MANAGEMENT - THP (TRANSPARENT HUGE PAGE)
 M:	Andrew Morton <akpm@linux-foundation.org>
 M:	David Hildenbrand <david@redhat.com>
+M:	Lorenzo Stoakes <lorenzo.stoakes@oracle.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>