[TCP]: Move the tcp sock states to net/tcp_states.h

Lots of places just needs the states, not even linux/tcp.h, where this
enum was, needs it.

This speeds up development of the refactorings as less sources are
rebuilt when things get moved from net/tcp.h.

Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/decnet/af_decnet.c

diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
index bd49dd9..621680f 100644
--- a/net/decnet/af_decnet.c
+++ b/net/decnet/af_decnet.c
@@ -118,7 +118,7 @@
 #include <linux/netfilter.h>
 #include <linux/seq_file.h>
 #include <net/sock.h>
-#include <net/tcp.h>
+#include <net/tcp_states.h>
 #include <net/flow.h>
 #include <asm/system.h>
 #include <asm/ioctls.h>