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 <jia.guo@intel.com>
Tested-by: Yingya Han <yingyax.han@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>
22e294e0e6