test(ff-a): signaling per-vCPU notifications (SP to VM)

To consolidate test from previous patch [1], validate signaling of
per-vCPU notifications from SP to NWd.

[1] I86ba840b4c1d35cce95e2bc197293511db6783a1

Signed-off-by: J-Alves <joao.alves@arm.com>
Change-Id: I1899badcb2b0ea0ce1fa84e249dc53c6fb73a0e5
3 files changed