feat(libtl): integrate Transfer List Library as submodule

Replaces in-tree transfer_list implementation with LibTL submodule.
Removes legacy source and headers, updates includes and makefiles
to use the standalone library. Adds architecture-specific inttypes
headers for compatibility.

Change-Id: Iff8272a6417983b9fb8e7f6bde6db44c2a6020f5
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
diff --git a/include/lib/event_log/event_log.h b/include/lib/event_log/event_log.h
index b5adfdc..964f80a 100644
--- a/include/lib/event_log/event_log.h
+++ b/include/lib/event_log/event_log.h
@@ -10,6 +10,7 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#include <lib/utils_def.h>
 #include <drivers/auth/crypto_mod.h>
 #include "event_handoff.h"
 #include "tcg.h"