net/dpaa2: change reference to private device

net/dpaa2: change reference to private device

The I/O threads for DPAA2 take their reference for bpool ID, the
port ID and other info like qdid, from the rte_eth_dev. Further,
to get this data during I/O operation, a reference of the RTE
device is kept in the queue structure (dpaa2_queue).

In case of secondary processes, rte_eth_dev is not same as the
primary process. Thus, the reference goes invalid.

This patch changes the implementation to use the dev_private
rather than the rte_eth_dev as that is shared area across
all the processes.

Signed-off-by: Shreyansh Jain <shreyansh.jain@nxp.com>