Merge branch 's390-qeth-next'

Julian Wiedmann says:

====================
s390/qeth: updates 2020-02-27

please apply the following patch series for qeth to netdev's net-next
tree.

This adds support for ETHTOOL_RX_COPYBREAK, along with small cleanups
and fine-tuning.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>