ibcore: Add support for RDMA/RoCE using VLAN(4) devices.
Classify VLAN devices as ethernet in rdma_copy_addr().
This fixes the following error message:
rdma_bind_addr: No such file or directory
Submitted by: bartosz.sobczak@intel.com (Bartosz Sobczak)
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D36120
Sponsored by: NVIDIA Networking