Merge branch 'lan966x-ptp'

Horatiu Vultur says:

====================
net: lan966x: Add PTP Hardward Clock support

Add support for PTP Hardware Clock (PHC) for lan966x. The switch supports
both PTP 1-step and 2-step modes.

v1->v2:
- fix commit messages
- reduce the scope of the lock ptp_lock inside the function
  lan966x_ptp_hwtstamp_set
- the rx timestamping is always enabled for all packages
====================

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