net: fec: remove unused members from struct fec_enet_private

Three members of struct fec_enet_private have not been used since
they were first introduced into the FEC driver (commit 6605b730
("FEC: Add time stamping code and a PTP hardware clock")). Namely,
last_overflow_check, rx_hwtstamp_filter and base_incval. These
unused members make the struct fec_enet_private a bit messy and
might confuse the readers. There is no reason to keep them in the
FEC driver any longer.
Signed-off-by: Wei Fang <wei.fang@nxp.com>
Link: https://lore.kernel.org/r/20230718090928.2654347-4-wei.fang@nxp.comReviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/freescale/fec.h

@@ -651,12 +651,9 @@ struct fec_enet_private {
 
 	struct ptp_clock *ptp_clock;
 	struct ptp_clock_info ptp_caps;
-	unsigned long last_overflow_check;
 	spinlock_t tmreg_lock;
 	struct cyclecounter cc;
 	struct timecounter tc;
-	int rx_hwtstamp_filter;
-	u32 base_incval;
 	u32 cycle_speed;
 	int hwts_rx_en;
 	int hwts_tx_en;