net/iavf: fix RXDID configure
net/iavf: fix RXDID configure

When configure Rx queue by virtchnnl, the RXDID (Rx Descriptor ID)
should be configured only if the Rx queue has been set up.

Fixes: 12b435bf8f2f ("net/iavf: support flex desc metadata extraction")

Signed-off-by: Jeff Guo <62aa901f8680899d1e8b3d9b45cf4843c2976e1c@intel.com>
Tested-by: Yingya Han <78a00984f1ec17135a439da154f6105584e280c6@intel.com>
Acked-by: Qi Zhang <9e9e58ffa71a29bb7b87766b362515be648fcbe0@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk