MAINTAINERS: add test_kho to KHO's entry

Commit b753522 ("kho: add test for kexec handover") introduced the
KHO test but missed adding it to KHO's MAINTAINERS entry.  Add it so the
KHO maintainers can get patches for its test.

Link: https://lkml.kernel.org/r/20251118182416.70660-1-pratyush@kernel.org
Fixes: b753522 ("kho: add test for kexec handover")
Signed-off-by: Pratyush Yadav <pratyush@kernel.org>
Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Alexander Graf <graf@amazon.com>
Cc: Mike Rapoport <rppt@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: prati0100

MAINTAINERS

@@ -13798,6 +13798,7 @@ F:	Documentation/admin-guide/mm/kho.rst
 F:	Documentation/core-api/kho/*
 F:	include/linux/kexec_handover.h
 F:	kernel/kexec_handover.c
+F:	lib/test_kho.c
 F:	tools/testing/selftests/kho/
 
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