MAINTAINERS: update SLAB ALLOCATOR maintainers

With permission, reduce the number of maintainers.  Create a CREDITS entry
for Joonsoo (Pekka already has one).  Thanks for all the work!

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Vlastimil Babka <[email protected]>
Acked-by: Harry Yoo <[email protected]>
Acked-by: Christoph Lameter (Ampere) <[email protected]>
Acked-by: David Rientjes <[email protected]>
Cc: Pekka Enberg <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: Roman Gushchin <[email protected]>
Cc: Brendan Jackman <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Cc: Zi Yan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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