test(tftf): prevent secure region access from Realm world

This change adds a TFTF test attempting an access to a memory region
marked Secure in the GPT from a Realm world.
RMM catches the GPF and return a proper code error which is used in
TFTF to assert the test result accordingly.

Signed-off-by: Nabil Kahlouche <nabil.kahlouche@arm.com>
Change-Id: I1c259e0db0910b5e4b72856c07613a8989ba9187
4 files changed