Merge branch 'net-dsa-mv88e6xxx-remove-redundant-ptp-timestamping-code'

Russell King says:

====================
net: dsa: mv88e6xxx: remove redundant ptp/timestamping code

mv88e6xxx as accumulated some unused data structures and code over the
years. This series removes it and simplifies the code. See the patches
for each change.
====================

Link: https://patch.msgid.link/aMKoYyN18FHFCa1q@shell.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>