dpif-netdev: Initialize dpif_flow attrs

dpif-netdev: Initialize dpif_flow attrs

In a previous commit, the dpif_flow struct was expanded, with the
'offloaded' field being moved into a new struct which also includes a
field for the dp layer the flow is handled on. The initialization of
these fields was only done in dpif-netlink.

This completes that commit, by initializing the fields in dpif-netdev
as well. As the 'offloaded' field was previously ignored by
dpif-netdev, the attrs are initialized to the default values of
'false' for the offloaded state, and 'ovs' for the dp layer.

Fixes: d63ca5329ff9 ("dpctl: Properly reflect a rule's offloaded to HW state")
Signed-off-by: Gavi Teitz <gavi@mellanox.com>
Acked-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>