MAINTAINERS: add myself as reviewer for slab

Recently I was involved in slab subsystem (reviewing struct slab,
SLUB debugfs and etc). I would like to help maintainers and people
working on slab allocators by reviewing and testing their work.

Let me be Cc'd on patches related to slab.

Signed-off-by: Hyeonggon Yoo <[email protected]>
Signed-off-by: Vlastimil Babka <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: hygoni

MAINTAINERS

@@ -18096,6 +18096,7 @@ M:	Joonsoo Kim <[email protected]>
 M:	Andrew Morton <[email protected]>
 M:	Vlastimil Babka <[email protected]>
 R:	Roman Gushchin <[email protected]>
+R:	Hyeonggon Yoo <[email protected]>
 L:	[email protected]
 S:	Maintained
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab.git