selinux: remove unneeded ipv6 hook wrappers

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2083580



commit 4342f705
Author: Florian Westphal <fw@strlen.de>
Date:   Mon Oct 11 22:22:29 2021 +0200

    selinux: remove unneeded ipv6 hook wrappers

    Netfilter places the protocol number the hook function is getting called
    from in state->pf, so we can use that instead of an extra wrapper.

    While at it, remove one-line wrappers too and make
    selinux_ip_{out,forward,postroute} useable as hook function.

Signed-off-by: Florian Westphal <fw@strlen.de>
    Message-Id: <20211011202229.28289-1-fw@strlen.de>
Signed-off-by: Paul Moore <paul@paul-moore.com>

Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>