test: exercise DMA isolation for secure access to ns memory

This test helps to validate a scenario where a secure stream
belonging to Cactus SP accesses non-secure IPA space.

Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
Change-Id: I8085f2974d53b9cec9b3ae4a17fd328607b76e2b
4 files changed