tests: posix: Test case portability.posix.common.tls.newlib.posix_realtime fails on nrf9160dk_nrf9160

[PerMac]

Describe the bug
The test case: portability.posix.common.tls.newlib.posix_realtime fails on nrf9160dk_nrf9160

To Reproduce
Steps to reproduce the behavior:

1. have nrf9160dk_nrf9160 connected to /dev/ttyACM0
2. Go to your zephyr dir
3. run ./scripts/twister -T /home/maciej/zephyrproject2/zephyr/tests/posix/common/ -p nrf9160dk_nrf9160 --device-testing --device-serial /dev/ttyACM0 --jobs 1 -v -v --ninja
4. See error

Expected behavior
Test passes

Impact
Not clear

Logs and console output

START - test_posix_realtime
POSIX clock set APIs
Assertion failed at WEST_TOPDIR/zephyr/tests/posix/common/src/clock.c:75: test_posix_realtime: (rts.tv_nsec not equal to mts.tv_nsec)
Nanoseconds not equal
FAIL - test_posix_realtime

Environment (please complete the following information):

• OS: Ubunktu 18.04
• Toolchain Zephyr SDK 0.12.2
• Commit SHA or Version used: zephyr-v2.5.0-647-gc5caa9b916d1

Additional context
The test passes for zephyr v2.5.0

[PerMac]

I closed this issue and reopen #31721 as it is the same problem