netfilter: Remove spurios included of netfilter.h

While testing my netfilter changes I noticed several files where
recompiling unncessarily because they unncessarily included
netfilter.h.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --cc drivers/net/hamradio/bpqether.c
Simple merge

diff --cc drivers/net/ppp/pptp.c
Simple merge

diff --cc drivers/net/wan/lapbether.c
Simple merge

diff --cc net/ax25/af_ax25.c
Simple merge

diff --cc net/ax25/ax25_in.c
Simple merge

diff --cc net/ax25/ax25_ip.c
Simple merge

diff --cc net/ax25/ax25_out.c
Simple merge

diff --cc net/ax25/ax25_uid.c
Simple merge

diff --cc net/netrom/nr_route.c
Simple merge

diff --cc net/rose/rose_link.c
Simple merge

diff --cc net/rose/rose_route.c
Simple merge

diff --cc security/selinux/xfrm.c
Simple merge