MAINTAINERS: update LTP maintainers

There are more people with git push permissions, but we keep only people
who actually did review and merge patches last year.

Link: https://lkml.kernel.org/r/20240104154953.1193634-1-pvorel@suse.cz


Signed-off-by: Petr Vorel <pvorel@suse.cz>
Reviewed-by: Li Wang <liwang@redhat.com>
Cc: Alexey Kodanev <aleksei.kodanev@bell-sw.com>
Cc: Jan Stancek <jstancek@redhat.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Wanlong Gao <wanlong.gao@gmail.com>
Cc: Yang Xu <xuyang2018.jy@fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>