netfilter: prepare xt_cgroup for multi revisions
xt_cgroup will grow cgroup2 path based match. Postfix existing symbols with _v0 and prepare for multi revision registration. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Daniel Wagner <daniel.wagner@bmw-carit.de> CC: Neil Horman <nhorman@tuxdriver.com> Cc: Jan Engelhardt <jengelh@inai.de> Cc: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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