net/bnxt: fix VNIC config on Rx queue stop

net/bnxt: fix VNIC config on Rx queue stop

Reconfigure a vnic's default ring if the current default ring is stopped
by the application. It picks the lowest numbered ring that is currently
active to be the new default, and issues the hwrm_vnic_cfg command to
update the configuration. Applies to adapters that are not Thor-based.

Fixes: 9b63c6fd70e3 ("net/bnxt: support Rx/Tx queue start/stop")
Cc: stable@dpdk.org
Signed-off-by: Samik Gupta <samik.gupta@broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Reviewed-by: Lance Richardson <lance.richardson@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>