net: phy: nxp-c45-tja11xx: read ext trig ts on TJA1120

commit 0886c946b94f4da0f4761d1b6f4af0e5d3c0ff5d from
https://github.com/nxp-auto-linux/linux



On TJA1120, the external trigger timestamp now has a VALID bit. This
changes the logic and we can't use the TJA1103 procedure.

For TJA1103, we can always read a valid timestamp from the registers,
compare the new timestamp with the old timestamp and, if they are not the
same, an event occurred. This logic cannot be applied for TJA1120 because
the timestamp is 0 if the VALID bit is not set.

Issue: ALB-10440

Signed-off-by: Radu Pirea (NXP OSS) <radu-nicolae.pirea@oss.nxp.com>
Link: https://lore.kernel.org/r/20230731091619.77961-11-radu-nicolae.pirea@oss.nxp.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>
(cherry picked from commit 08e6547c)
Signed-off-by: Zhantao Tang <zhantao.tang@windriver.com>