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

This change adds a TFTF test attempting an access to a memory region
marked Root in the GPT from a Realm world.
rmm catch 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: I6f4cfdec4777879d75924bb55b9b77182a3dcea6
2 files changed