tests: Exclude qemu_arc{em|hs} in some

See https://app.shippable.com/github/zephyrproject-rtos/zephyr/runs/73233/4/tests



And so until "icount" is implemented in QEMU for ARC we exclude
"tickless_concept" & "timer_api" from sanitycheck tests.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>