dpif-netlink: Allow offloading of flows with dl_type 0x1234.

dpif-netlink: Allow offloading of flows with dl_type 0x1234.

'dpif_probe_feature()' always has DPIF_FP_PROBE flag set. Other probing
code uses dpif_execute() with DPIF_OP_EXECUTE, hence never calls
parse_flow_put().
Thus, this 'if' statement is wrong and should be removed as it only
forbids offloading of the real legitimate flows with dl_type 0x1234.
Dummy flows never reach this code.

CC: Paul Blakey <paulb@mellanox.com>
Fixes: 8b668ee3f0cc ("dpif-netlink: Use netdev flow put api to insert a flow")
Reported-by: Eli Britstein <elibr@mellanox.com>
Acked-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Ilya Maximets <i.maximets@samsung.com>