eth_nxp_enet_qos: Fixup logging in driver

Some of the logging was not very useful and missing info, some were the
wrong level. Such as routine drops of packets, this happens sometimes
and is not ideal but not going to cause things to fall apart, so demote
those messages. RX buffer underrun for example is pretty unavoidable
with enough traffic going on the local network.

Signed-off-by: Declan Snyder <declan.snyder@nxp.com>