net/cxgbe: fix queue DMA ring leaks during port close

net/cxgbe: fix queue DMA ring leaks during port close

Free up the DMA memzones properly for all the port's queues during
port close. So, rework DMA ring allocation/free logic to use
rte_eth_dma_zone_reserve()/rte_eth_dma_zone_free() helper functions
for allocating/freeing the memzones.

The firmware event queue doesn't have an associated freelist queue.
So, remove check that tries to give memzone name for a non-existent
freelist queue.

Also, add a missing free for the control queue mempools.

Fixes: 0462d115441d ("cxgbe: add device related operations")
Cc: stable@dpdk.org
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>