net: extract port range fields from fl_flow_key

[ Upstream commit 83d85bb0 ]

So it can be used for port range filter offloading.

Co-developed-by: Volodymyr Mytnyk <volodymyr.mytnyk@plvision.eu>
Signed-off-by: Volodymyr Mytnyk <volodymyr.mytnyk@plvision.eu>
Signed-off-by: Maksym Glubokiy <maksym.glubokiy@plvision.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: 3e579686 ("flow_dissector: Fix handling of mixed port and port-range keys")
Signed-off-by: Sasha Levin <sashal@kernel.org>