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]>

Author: tehcaster

CREDITS

@@ -2071,6 +2071,10 @@ S: 660 Harvard Ave. #7
 S: Santa Clara, CA 95051
 S: USA
 
+N: Joonsoo Kim
+E: [email protected]
+D: Slab allocators
+
 N: Kukjin Kim
 E: [email protected]
 D: Samsung S3C, S5P and Exynos ARM architectures

MAINTAINERS

@@ -22249,9 +22249,7 @@ F:	drivers/nvmem/layouts/sl28vpd.c
 
 SLAB ALLOCATOR
 M:	Christoph Lameter <[email protected]>
-M:	Pekka Enberg <[email protected]>
 M:	David Rientjes <[email protected]>
-M:	Joonsoo Kim <[email protected]>
 M:	Andrew Morton <[email protected]>
 M:	Vlastimil Babka <[email protected]>
 R:	Roman Gushchin <[email protected]>