When boot from virtio blk device, seabios in QEMU only enables one queue.
To work in this scenario, vDPA BLK device back-end configure device
when the first queue is ready.
Signed-off-by: Andy Pei <andy.pei@intel.com>
Signed-off-by: Huang Wei <wei.huang@intel.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>