MAINTAINERS: add mm folks as reviewers to rust alloc

MAINTAINERS: add mm folks as reviewers to rust alloc

The alloc implementation is a thin wrapper over slab/vmalloc, so to help
out on the mm side of things and to be cc'd on changes, add some mm people
as reviewers.

Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Acked-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Link: https://lore.kernel.org/r/20250708183747.104286-1-lorenzo.stoakes@oracle.com
Signed-off-by: Danilo Krummrich <dakr@kernel.org>