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

The Event Log Library has been relocated to a separate repository and is
now integrated as a submodule, eliminating the need for in-tree files
and reducing maintenance efforts for TFTF.

Change-Id: I29694f8b3b08bb1d57dd685f6e42dc9f69d241bb
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
diff --git a/tftf/tests/tests-firmware-handoff.mk b/tftf/tests/tests-firmware-handoff.mk
index c7ca2cd..3620642 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	+=	${EVENT_LOG_SOURCES} ${LIBTL_SOURCES}
+TESTS_SOURCES	+=	${LIBEVLOG_SOURCES} ${LIBTL_SOURCES}
 
 endif