test(notifications): signaling from MP SP to UP SP

Test setting notifications from all running cores, sender being an MP
SP and the receiver an UP SP. Intent is to validate a different flow
for triggering SRI, and validate handling of per-vCPU notifications
targeting a UP SP.

Signed-off-by: J-Alves <joao.alves@arm.com>
Change-Id: I4f54ef9c4de0558dcbc3a1245cafb6da267752b7
3 files changed