net/bnxt: fix memzone free for Tx and Rx rings

net/bnxt: fix memzone free for Tx and Rx rings

The device cleanup logic was freeing most of the ring related memory,
but was not freeing up the memzone associated with the rings.
This patch fixes the issue.

Fixes: 2eb53b134aae ("net/bnxt: add initial Rx code")
Fixes: 6eb3cc2294fd ("net/bnxt: add initial Tx code")
Cc: stable@dpdk.org
Signed-off-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Reviewed-by: Lance Richardson <lance.richardson@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>