MAINTAINERS: add co-maintainer and reviewer for SLAB ALLOCATOR

Promote Harry Yoo from reviewer to maintainer.  Harry's been involved in
slab development for multiple years now and doing a great job.

Add Hao Li as a new reviewer.  Hao has been doing very useful reviews for
a while now, so make it official and ensure the Cc's.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Vlastimil Babka (SUSE) <[email protected]>
Acked-by: Lorenzo Stoakes <[email protected]>
Acked-by: Harry Yoo <[email protected]>
Acked-by: Hao Li <[email protected]>
Acked-by: SeongJae Park <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Roman Gushchin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: Vlastimil Babka (SUSE)

MAINTAINERS

@@ -24361,11 +24361,12 @@ F:	drivers/nvmem/layouts/sl28vpd.c
 
 SLAB ALLOCATOR
 M:	Vlastimil Babka <[email protected]>
+M:	Harry Yoo <[email protected]>
 M:	Andrew Morton <[email protected]>
+R:	Hao Li <[email protected]>
 R:	Christoph Lameter <[email protected]>
 R:	David Rientjes <[email protected]>
 R:	Roman Gushchin <[email protected]>
-R:	Harry Yoo <[email protected]>
 L:	[email protected]
 S:	Maintained
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab.git