octeontx2-af: Add PTP PPS Errata workaround on CN10K silicon

Errata:
The ptp_clock_hi rollsover to zero one clock cycle before it
reaches one second boundary. As a result, the pps threshold
comparison fails after one second and the pps output signal
won't toggle further.

This patch workarounds the issue by programming the pps_lo_incr
register to 500msec minus one clock cycle period, ensuring that
the pps threshold comparison succeeds at one second rollover
boundary and pps edge toggles. After that point, the driver will
have enough time (~500msec) to reset the pps threshold value.
After each one second boundary, hrtimer is invoked which resets
the pps threshold value.

Signed-off-by: Naveen Mamindlapalli <[email protected]>
Signed-off-by: Rakesh Babu Saladi <[email protected]>
Signed-off-by: Sunil Kovvuri Goutham <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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