feat(ff-a): add v1.2 fields to RXTX header

Add the new fields introduced in v1.2 to the partition message header.
This will fix the tests that were failing due to the `offset` being too small.

Change-Id: I58ddd8f6897d0e46b7c7f754fde7ecddd012a0ca
Signed-off-by: Karl Meakin <karl.meakin@arm.com>
diff --git a/include/runtime_services/ffa_helpers.h b/include/runtime_services/ffa_helpers.h
index 4dc3f53..0a63e96 100644
--- a/include/runtime_services/ffa_helpers.h
+++ b/include/runtime_services/ffa_helpers.h
@@ -357,8 +357,8 @@
  */
 struct ffa_partition_rxtx_header {
 	uint32_t flags;
-	/* MBZ */
-	uint32_t reserved;
+	/* Reserved (SBZ). */
+	uint32_t reserved_1;
 	/* Offset from the beginning of the buffer to the message payload. */
 	uint32_t offset;
 	/* Sender(Bits[31:16]) and Receiver(Bits[15:0]) endpoint IDs. */
@@ -366,6 +366,10 @@
 	ffa_id_t sender;
 	/* Size of message in buffer. */
 	uint32_t size;
+	/* Reserved (SBZ). Added in v1.2 */
+	uint32_t reserved_2;
+	/* UUID identifying the communication protocol. Added in v1.2. */
+	struct ffa_uuid uuid;
 };
 
 #define FFA_RXTX_HEADER_SIZE sizeof(struct ffa_partition_rxtx_header)
@@ -375,11 +379,13 @@
 	struct ffa_partition_rxtx_header *header)
 {
 	header->flags = 0;
-	header->reserved = 0;
+	header->reserved_1 = 0;
 	header->offset = FFA_RXTX_HEADER_SIZE;
 	header->sender = sender;
 	header->receiver = receiver;
 	header->size = size;
+	header->reserved_2 = 0;
+	header->uuid = (struct ffa_uuid){0};
 }
 
 /* The maximum length possible for a single message. */