net: rcar_gen4_ptp: Move control fields to users

net: rcar_gen4_ptp: Move control fields to users

The struct rcar_gen4_ptp_private provides two fields for convenience of
its users, tstamp_tx_ctrl and tstamp_rx_ctrl. These fields are not used
by the rcar_gen4_ptp driver itself but only by the drivers using it.

Upcoming work will enable the RAVB driver currently only supporting gPTP
on pre-Gen4 SoCs to use the Gen4 implementation as well. To facilitate
this the convenience of having these fields in struct
rcar_gen4_ptp_private becomes a problem as the RAVB driver already have
it's own driver specific fields for the same thing.

Move the fields from struct rcar_gen4_ptp_private to each driver using
the Gen4 gPTP clocks own private data structures. There is no functional
change.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20251104222420.882731-3-niklas.soderlund+renesas@ragnatech.se
Signed-off-by: Jakub Kicinski <kuba@kernel.org>