test(rme): rxtx buffers are in the realm PAS

Added a test for which the SPMC attempts to use the RXTX
buffers, in an RME enabled platform and in which the buffers
were changed to realm PAS.

Signed-off-by: J-Alves <joao.alves@arm.com>
Change-Id: Idb29f8687fbe5885c00e61155a5ebbdd8908d688
3 files changed