Merge branch 'net-ptp-introduce-common-defines-for-ptp-message-types'

Christian Eggers says:

====================
net: ptp: introduce common defines for PTP message types

This series introduces commen defines for PTP event messages. Driver
internal defines are removed and some uses of magic numbers are replaced
by the new defines.
====================

Link: https://lore.kernel.org/r/20201120084106.10046-1-ceggers@arri.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>