test(cactus): add test for NS memory sharing between SPs

Define a new shared memory region in 48-bit address range
(configured as NS in the TZC) in cactus-tertiary's manifest.
Since SPs can share either secure or non-secure memory, propagate the
security information in the relevant cactus commands:
CACTUS_REQ_MEM_SEND_CMD and CACTUS_MEM_SEND_CMD.

Change-Id: I10af24c96ff8fc0d13c80a52b0264a1482a5cf56
Signed-off-by: Federico Recanati <federico.recanati@arm.com>
8 files changed