Merge branch 'ethtool-get_ts_stats-for-dsa-and-ocelot-driver'

Vladimir Oltean says:

====================
ethtool get_ts_stats() for DSA and ocelot driver

After a recent patch set with fixes and general restructuring, Jakub asked
for the Felix DSA driver to start reporting standardized statistics
for hardware timestamping:
https://lore.kernel.org/netdev/20241207180640.12da60ed@kernel.org/

Testing follows the same procedure as in the aforementioned series, with PTP
packet loss induced through taprio:

$ ethtool -I --show-time-stamping swp3
Time stamping parameters for swp3:
Capabilities:
        hardware-transmit
        software-transmit
        hardware-receive
        software-receive
        software-system-clock
        hardware-raw-clock
PTP Hardware Clock: 1
Hardware Transmit Timestamp Modes:
        off
        on
        onestep-sync
Hardware Receive Filter Modes:
        none
        ptpv2-l4-event
        ptpv2-l2-event
        ptpv2-event
Statistics:
  tx_pkts: 14591
  tx_lost: 85
  tx_err: 0

v1: https://lore.kernel.org/20241213140852.1254063-1-vladimir.oltean@nxp.com/
====================

Link: https://patch.msgid.link/20250116104628.123555-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>