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/tests-firmware-handoff.mk b/tftf/tests/tests-firmware-handoff.mk
index 3620642..c7ca2cd 100644
--- a/tftf/tests/tests-firmware-handoff.mk
+++ b/tftf/tests/tests-firmware-handoff.mk
@@ -9,10 +9,10 @@
 include lib/event_log/event_log.mk
 include lib/libtl/libtl.mk
 
-TESTS_SOURCES	+=	$(addprefix tftf/tests/misc_tests/,	\
-				test_firmware_handoff.c		\
+TESTS_SOURCES	+=	$(addprefix tftf/tests/misc_tests/,		\
+	test_firmware_handoff.c						\
 )
 
-TESTS_SOURCES	+=	${LIBEVLOG_SOURCES} ${LIBTL_SOURCES}
+TESTS_SOURCES	+=	${EVENT_LOG_SOURCES} ${LIBTL_SOURCES}
 
 endif