fix(spm): add device-regions used in tf-a-tests

Device memory region specified in an SP manifest are now validated
against the device memory defined in the SPMC manifest. Therefore
we need to add the device memory used in the tf-a-tests to the SPMC
manifests.

Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>
Change-Id: I47376e67c700705d12338d7078292618a15d5546