virtio: fix build on freebsd
virtio: fix build on freebsd

This patch fixes the compilation issue on freebsd:
lib/librte_pmd_virtio/virtio_ethdev.c: In function 'virtio_resource_init':
lib/librte_pmd_virtio/virtio_ethdev.c:1071:56: error: unused parameter 'pci_dev' [-Werror=unused-parameter]

Fixes: da978dfdc43b ("virtio: use port IO to get PCI resource")

Signed-off-by: Changchun Ouyang <593bf1f161e79772915ea885e47cf0e95f4498c0@intel.com>
Acked-by: Cunming Liang <7edc6dd0948177c688da9b288939d80da3db4303@intel.com>

phermansson/dpdk,phermansson/dpdk,phermansson/dpdk,phermansson/dpdk