Merge branch 's390-qeth-fixes-2020-11-20'

Julian Wiedmann says:

====================
s390/qeth: fixes 2020-11-20

This brings several fixes for qeth's af_iucv-specific code paths.

Also one fix by Alexandra for the recently added BR_LEARNING_SYNC
support. We want to trust the feature indication bit, so that HW can
mask it out if there's any issues on their end.
====================

Link: https://lore.kernel.org/r/20201120090939.101406-1-jwi@linux.ibm.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>