test(sdei): SDEI event signaling state (registered, enabled, unmasked)

This patch adds a test to check whether only a registered, enabled
and unmasked SDEI event can be signaled successfully.

In other conditions the event signaling process should fail early.

Change-Id: I3ce76ed060bc32648cea43dcce65b707d97c3a78
Signed-off-by: Igor Podgainõi <igor.podgainoi@arm.com>
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
2 files changed