qemu_arc_{em,hs} keeps failing in CI on tests/kernel/lifo/lifo_usage

[nashif]

Describe the bug
Keeps failing in CI

https://app.shippable.com/github/zephyrproject-rtos/zephyr/runs/75382/3/tests

*** Booting Zephyr OS build zephyr-v2.3.0-305-gb04ff83884de  ***
Running test suite test_lifo_usage
===================================================================
starting test - test_lifo_nowait
PASS - test_lifo_nowait
===================================================================
starting test - test_lifo_wait
PASS - test_lifo_wait
===================================================================
starting test - test_timeout_empty_lifo
PASS - test_timeout_empty_lifo
===================================================================
starting test - test_timeout_non_empty_lifo
PASS - test_timeout_non_empty_lifo
===================================================================
starting test - test_timeout_lifo_thread

    Assertion failed at WEST_TOPDIR/zephyr/tests/kernel/lifo/lifo_usage/src/main.c:329: test_timeout_lifo_thread: packet != NULL is false

FAIL - test_timeout_lifo_thread
===================================================================
starting test - test_timeout_threads_pend_on_lifo

    Assertion failed at WEST_TOPDIR/zephyr/tests/kernel/lifo/lifo_usage/src/main.c:401: test_thread_pend_and_timeout: packet == NULL is false

FAIL - test_timeout_threads_pend_on_lifo
===================================================================
Test suite test_lifo_usage failed.
===================================================================
PROJECT EXECUTION FAILED

excluding it for now, but need a fix.

EDIT: This test fails on both qemu_arc_hs and qemu_arc_em.

[stephanosio]

This test fails on both qemu_arc_hs and qemu_arc_em.

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