Revert "tests: exclude qemu_arc_hs in lifo_usage test"

This reverts commit 6f4f5b1fe5fc9d75d16f7363b7f495f591fb14da.

With icount finally working in QEMU for ARC these tests start to
pass reliably, so no need to exclude them any longer.

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