netfilter: clusterip: make sure arp hooks are available

The clusterip target needs to register an arp mangling hook,
so make sure NF_ARP hooks are available.

Fixes: 2a95183a ("netfilter: don't allocate space for arp/bridge hooks unless needed")
Reported-by: kernel test robot <fengguang.wu@intel.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>