revert: replace in-tree Event Log Lib w/ submodule

This reverts commit cc89c2fc40c74ea8d8f1a1489ea988c66c1b5849.

Reason for revert: Causing CI failures

Change-Id: Iad32fb9ba1d32044ef647f01e3091e9b0ee0d9e2
diff --git a/tftf/tests/misc_tests/test_firmware_handoff.c b/tftf/tests/misc_tests/test_firmware_handoff.c
index fe93088..026f057 100644
--- a/tftf/tests/misc_tests/test_firmware_handoff.c
+++ b/tftf/tests/misc_tests/test_firmware_handoff.c
@@ -6,7 +6,7 @@
 
 #include <assert.h>
 
-#include <tcg.h>
+#include <drivers/measured_boot/event_log/tcg.h>
 #include <test_helpers.h>
 #include <tftf_lib.h>
 #include <transfer_list.h>