core: Add TX/RX API that exposes message tag and tag owner

MCTP received packets can carry a message tag and tag owner bit
which is set by a remote MCTP endpoint. This can be used by the
remote MCTP endpoint to track the responses. Thus, libmctp should
provide a mechanism for the upper layer MCTP applications to
respond with the same message tag.

This patchset extends TX and RX API with message tag and
tag owner bits.

Signed-off-by: Sumanth Bhat <sumanth.bhat@linux.intel.com>
Change-Id: I6d07eafa86c653abdd4313ab7cc77e5a93124477
diff --git a/utils/mctp-in.c b/utils/mctp-in.c
index eff4abf..d4987ce 100644
--- a/utils/mctp-in.c
+++ b/utils/mctp-in.c
@@ -12,11 +12,11 @@
 #include <sys/poll.h>
 #include <sys/socket.h>
 
-static void rx_message(uint8_t eid, void *data, void *msg, size_t len)
+static void
+rx_message(uint8_t eid __unused, bool tag_owner __unused,
+	   uint8_t msg_tag __unused, void *data __unused, void *msg, size_t len)
 {
 	ssize_t rc;
-	(void)eid;
-	(void)data;
 
 	rc = write(STDOUT_FILENO, msg, len);
 	if (rc < 0)