net/dpaa2: fix getting link status

net/dpaa2: fix getting link status

According to DPDK Documentation, rte_eth_link_get API can wait up to 9
seconds for auto-negotiation to finish and then returns link status.

In current implementation of rte_eth_link_get API in DPAA2 drivers, it
was not waiting for auto negotiation to finish and was returning link
status DOWN
It can cause issues with DPDK applications which relies on
rte_eth_link_get API for link status and does not support link status
interrupt.
Similar kind of issue was seen in TRex Application.

This patch fixes this bug by adding wait for up to 9 seconds for auto
negotiation to finish.

Fixes: c56c86ff87c1 ("net/dpaa2: update link status")
Cc: stable@dpdk.org
Signed-off-by: Rohit Raj <rohit.raj@nxp.com>
Acked-by: Hemant Agrawal <hemant.agrawal@nxp.com>