MAINTAINERS: update MEMORY MAPPING section

MAINTAINERS: update MEMORY MAPPING section

Update the MEMORY MAPPING section to contain VMA logic as it makes no
sense to have these two sections separate.

Additionally, add files which permit changes to the attributes and/or
ranges spanned by memory mappings, in essence anything which might alter
the output of /proc/$pid/[s]maps.

This is necessarily fuzzy, as there is not quite as good separation of
concerns as we would ideally like in the kernel.  However each of these
files interacts with the VMA and memory mapping logic in such a way as to
be inseparatable from it, and it is important that they are maintained in
conjunction with it.

Link: https://lkml.kernel.org/r/20241211105315.21756-1-lorenzo.stoakes@oracle.com
Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jann Horn <jannh@google.com>
Cc: Liam R. Howlett <Liam.Howlett@Oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>