tools/mm: remove references to free_ts from page_owner_sort

mainline inclusion
from mainline-v6.7-rc1
commit 0179c62839bdc49769a986e6eb1a6ca6fc7d274a
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8XGY0
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=0179c62839bdc49769a986e6eb1a6ca6fc7d274a

-------------------------------------------

With the removal of free timestamps from page_owner output, we no longer
need to handle this case or the "unreleased" case.  Remove all references
to both cases.

Link: https://lkml.kernel.org/r/20231013190350.579407-3-audra@redhat.com


Signed-off-by: Audra Mitchell <audra@redhat.com>
Acked-by: Rafael Aquini <aquini@redhat.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Georgi Djakov <djakov@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jinjiang Tu <tujinjiang@huawei.com>