test(spm): validate NWd can't share forbidden addresses

Validate that the NWd can't share memory addresses that are owned
by SPMC, or the SPs. Such scenario could be used to circumvent
SPM enforced sandboxing of each SP.

Signed-off-by: J-Alves <joao.alves@arm.com>
Change-Id: I43abffc0122183222d701c2a44cc806ca620b1ca
2 files changed