ice/ptp: fix crosstimestamp reporting

BugLink: https://bugs.launchpad.net/bugs/2119603

[ Upstream commit a5a441ae283d54ec329aadc7426991dc32786d52 ]

Set use_nsecs=true as timestamp is reported in ns. Lack of this result
in smaller timestamp error window which cause error during phc2sys
execution on E825 NICs:
phc2sys[1768.256]: ioctl PTP_SYS_OFFSET_PRECISE: Invalid argument

This problem was introduced in the cited commit which omitted setting
use_nsecs to true when converting the ice driver to use
convert_base_to_cs().

Testing hints (ethX is PF netdev):
phc2sys -s ethX -c CLOCK_REALTIME  -O 37 -m
phc2sys[1769.256]: CLOCK_REALTIME phc offset -5 s0 freq      -0 delay    0

Fixes: d4bea54 ("ice/ptp: Remove convert_art_to_tsc()")
Signed-off-by: Anton Nadezhdin <[email protected]>
Reviewed-by: Aleksandr Loktionov <[email protected]>
Reviewed-by: Arkadiusz Kubalewski <[email protected]>
Tested-by: Rinitha S <[email protected]> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
Signed-off-by: Manuel Diewald <[email protected]>
Signed-off-by: Mehmet Basaran <[email protected]>

Author: anadezhd

drivers/net/ethernet/intel/ice/ice_ptp.c

@@ -2243,6 +2243,7 @@ ice_ptp_get_syncdevicetime(ktime_t *device,
 			hh_ts = ((u64)hh_ts_hi << 32) | hh_ts_lo;
 			system->cycles = hh_ts;
 			system->cs_id = CSID_X86_ART;
+			system->use_nsecs = true;
 			/* Read Device source clock time */
 			hh_ts_lo = rd32(hw, GLTSYN_HHTIME_L(tmr_idx));
 			hh_ts_hi = rd32(hw, GLTSYN_HHTIME_H(tmr_idx));