tests/kernel/tickless/tickless_concept fails on ARC boards

[spoorthik]

Execution log on emsk:

***** Booting Zephyr OS zephyr-v1.13.0-1232-g556dc7f (delayed boot 1000ms) *****
Running test suite tickless_concept
===================================================================
starting test - test_tickless_sysclock
ASSERTION FAIL [timer_count <= programmed_limit] @ /home/kspoorth/work/latest_zephyr/drivers/timer/arcv2_timer0.c:444:
        timer_count: 279, limit 0

Execution log on quark_se_c1000_ss_devboard:

***** Booting Zephyr OS zephyr-v1.13.0-1232-g556dc7f (delayed boot 1000ms) *****
Running test suite tickless_concept
===================================================================
starting test - test_tickless_sysclock
time 1030, -422565944
time -422565934, -845132908
PASS - test_tickless_sysclock
===================================================================
starting test - test_tickless_slice
elapsed slice -422566974, expected: <100, 110>

    Assertion failed at /home/kspoorth/work/latest_zephyr/tests/kernel/tickless/tickless_concept/src/main.c:57: thread_tslice: t >= SLICE_SIZE is false

elapsed slice 20, expected: <100, 110>

    Assertion failed at /home/kspoorth/work/latest_zephyr/tests/kernel/tickless/tickless_concept/src/main.c:57: thread_tslice: t >= SLICE_SIZE is false

elapsed slice 10, expected: <100, 110>

    Assertion failed at /home/kspoorth/work/latest_zephyr/tests/kernel/tickless/tickless_concept/src/main.c:57: thread_tslice: t >= SLICE_SIZE is false

elapsed slice 20, expected: <100, 110>

    Assertion failed at /home/kspoorth/work/latest_zephyr/tests/kernel/tickless/tickless_concept/src/main.c:57: thread_tslice: t >= SLICE_SIZE is false

FAIL - test_tickless_slice
===================================================================
===================================================================
PROJECT EXECUTION FAILED