tests: kernel: interrupt: do not run for Cortex-M Non-Secure mode

tests/kernel/interrupt tests interrupt trigger functionality,
however, the Non-Secure Cortex-M mode does not have full control
of the interrupt handling, so this test cannot be guaranteed to
pass when executing in Non-Secure mode. Filter the test out for
Non-Secure Cortex-M builds.

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>