netfilter: ipv4: use NFPROTO values for NF_HOOK invocation

The semantic patch that was used:
// <smpl>
@@
@@
(NF_HOOK
|NF_HOOK_COND
|nf_hook
)(
-PF_INET,
+NFPROTO_IPV4,
 ...)
// </smpl>

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>

diff --cc net/ipv4/ip_forward.c
Simple merge

diff --cc net/ipv4/ip_input.c
Simple merge

diff --cc net/ipv4/ip_output.c
Simple merge

diff --cc net/ipv4/ipmr.c
Simple merge

diff --cc net/ipv4/raw.c
Simple merge

diff --cc net/ipv4/xfrm4_input.c
Simple merge

diff --cc net/ipv4/xfrm4_output.c
Simple merge