Use rdma_flow_label_to_udp_sport to calculate the UDP source port of the
RoCEV2 packet.

Link: https://lore.kernel.org/r/20200504051935.269708-3-leon@kernel.orgSigned-off-by: NMaor Gottlieb <maorg@mellanox.com>
Signed-off-by: NLeon Romanovsky <leonro@mellanox.com>
Signed-off-by: NJason Gunthorpe <jgg@mellanox.com>