tcp: move ir_mark initialization to tcp_openreq_init

ir_mark initialization is done for both TCP v4 and v6, move it in the
common tcp_openreq_init function.

Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc include/net/tcp.h
Simple merge

diff --cc net/ipv4/tcp_ipv4.c
Simple merge

diff --cc net/ipv6/tcp_ipv6.c
Simple merge