crypto/virtio: allocate private data by NUMA affinity

crypto/virtio: allocate private data by NUMA affinity

It's better to allocate device private data on the same NUMA node with
device, rather than with the main thread. This helps avoid cross-NUMA
access for worker thread.

Signed-off-by: Xiao Wang <xiao.w.wang@intel.com>
Reviewed-by: Jay Zhou <jianjay.zhou@huawei.com>