MAINTAINERS: add missing zsmalloc file

The mm/zpdesc.h file is only included by mm/zsmalloc.c so the zsmalloc
section seems the most appropriate place for this file.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Lorenzo Stoakes <[email protected]>
Cc: Alistair Popple <[email protected]>
Cc: Christoph Lameter (Ampere) <[email protected]>
Cc: Dave Chinner <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Dennis Zhou <[email protected]>
Cc: Dev Jain <[email protected]>
Cc: Jann Horn <[email protected]>
Cc: Liam Howlett <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Mike Rapoport <[email protected]>
Cc: Muchun Song <[email protected]>
Cc: Nico Pache <[email protected]>
Cc: Oscar Salvador <[email protected]>
Cc: Pedro Falcato <[email protected]>
Cc: Qi Zheng <[email protected]>
Cc: Roman Gushchin <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Cc: Tejun Heo <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: Zi Yan <[email protected]>
Cc: Shakeel Butt <[email protected]>
Cc: Joshua Hahn <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: lorenzo-stoakes

MAINTAINERS

@@ -27465,6 +27465,7 @@ L:	[email protected]
 S:	Maintained
 F:	Documentation/mm/zsmalloc.rst
 F:	include/linux/zsmalloc.h
+F:	mm/zpdesc.h
 F:	mm/zsmalloc.c
 
 ZSTD