MAINTAINERS: split up MEMORY MANAGEMENT - MEMORY POLICY AND MIGRATION

Patch series "MAINTAINERS: rework MEMORY MANAGEMENT - MEMORY POLICY".

Let's rework MEMORY MANAGEMENT - MEMORY POLICY AND MIGRATION.

As I can use some maintenance help in that area, add Gregory as a new
co-maintainer for the split out MEMORY MANAGEMENT - NUMA PLACEMENT
section.


This patch (of 3):

Let's split it up into MIGRATION and NUMA PLACEMENT.  The latter is a
better fitting description for mempolicy.c.

Make a best guess about which pieces existing reviewers are interested in.
Move the split sections to keep alphabetical order.

Link: https://lore.kernel.org/20260918-maintainers-mempolicy-v1-1-9a94cac6d135@kernel.org
Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Acked-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Joshua Hahn <joshua.hahnjy@gmail.com>
Reviewed-by: SJ Park <sj@kernel.org>
Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Byungchul Park <byungchul@sk.com>
Cc: Gregory Price <gourry@gourry.net>
Cc: "Huang, Ying" <ying.huang@linux.alibaba.com>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Rakie Kim <rakie.kim@sk.com>
Cc: Suren Baghdasaryan <surenb@google.com>