net: let flow have same hash in two directions

[ Upstream commit 1e60cebf ]

using same source and destination ip/port for flow hash calculation
within the two directions.

Signed-off-by: zhang kai <zhangkaiheb@126.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: 64ae13ed ("net: core: fix flow symmetric hash")
Signed-off-by: Sasha Levin <sashal@kernel.org>