tests/kernel/sched/preempt: enable test for native_posix

The native_posix board does model irq_offload properly now
and therefore this test can be executed without problems.
So let's enable it.

Related to commit:
86b53643350f4883d5ed70219db37d14c92489b6

Signed-off-by: Alberto Escolar Piedras <alpi@oticon.com>
1 file changed