SPM: Test interrupt preemption

Blocking requests shouldn't be preemptible, non-blocking request should be.
The tests verify that each type works as expected.

Change-Id: I84d32d4e00a9b62f12a3f28498ae880d2461520b
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
4 files changed