netfilter: remove ipt_SAME.h and ipt_realm.h

These two headers are not required anymore, they have been
replaced by xt_SAME.h and xt_realm.h.

Florian Westphal pointed out this.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: Florian Westphal <fw@strlen.de>
Signed-off-by: WANG Cong <xiyou.wangcong@gmail.>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>