Merge branch 'broadcom-ptp-phy-support'

Jonathan Lemon says:

====================
Broadcom PTP PHY support

This adds PTP support for the Broadcom PHY BCM54210E (and the
specific variant BCM54213PE that the rpi-5.15 branch uses).

This has only been tested on the RPI CM4, which has one port.

There are other Broadcom chips which may benefit from using the
same framework here, although with different register sets.
====================

Link: https://lore.kernel.org/r/20220622050454.878052-1-jonathan.lemon@gmail.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>