FIX: init interfaces for rdma-core driver

We're only initializing interfaces for avf and af_xdp VPP drivers. This
causes issues for the rdma-core driver when the underlying mlnx kernel
driver is not bound. Fix this so that all interfaces are properly bound
to the kernel driver required by rdma-core.

Change-Id: I204309a9bb61b56b96497a287178f0b1efe2f362
Signed-off-by: Juraj Linkeš <juraj.linkes@pantheon.tech>