Cactus: Add third partion to ffa tests

Add the third partition to the ffa_partition_info_get test to test
that a partition can successfully get information about the third cactus
partition

Signed-off-by: Ruari Phipps <ruari.phipps@arm.com>
Change-Id: Ib8c69f16e217f9631be005c7759753d05704afd2
diff --git a/spm/cactus/cactus_def.h b/spm/cactus/cactus_def.h
index 0d3df2e..5a4a5dd 100644
--- a/spm/cactus/cactus_def.h
+++ b/spm/cactus/cactus_def.h
@@ -24,7 +24,7 @@
  * RX/TX buffer used by VM's in SPM for memory sharing
  * Each VM allocated 2 pages, one for RX and one for TX buffer.
  */
-#define CACTUS_RX_BASE			ULL(0x7200000)
+#define CACTUS_RX_BASE			ULL(0x7300000)
 #define CACTUS_TX_BASE			CACTUS_RX_BASE + PAGE_SIZE
 #define CACTUS_RX_TX_SIZE		PAGE_SIZE * 2
 
@@ -41,5 +41,7 @@
  */
 #define PRIMARY_UUID {0xb4b5671e, 0x4a904fe1, 0xb81ffb13, 0xdae1dacb}
 #define SECONDARY_UUID {0xd1582309, 0xf02347b9, 0x827c4464, 0xf5578fc8}
+#define TERTIARY_UUID {0x79b55c73, 0x1d8c44b9, 0x859361e1, 0x770ad8d2}
+
 
 #endif /* CACTUS_DEF_H */