fix(tftf): resolve build issues

This patch resolves build issues introduced by commit [1].

[1]: https://review.trustedfirmware.org/c/TF-A/tf-a-tests/+/18037

Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: I758642eda440383cbd3ddf9027a864616e0254e4
diff --git a/tftf/tests/tests-rmi-spm.mk b/tftf/tests/tests-rmi-spm.mk
index 960aa93..289c077 100644
--- a/tftf/tests/tests-rmi-spm.mk
+++ b/tftf/tests/tests-rmi-spm.mk
@@ -10,6 +10,7 @@
 TESTS_SOURCES	+=							\
 	$(addprefix tftf/tests/runtime_services/host_realm_managment/,	\
 		host_realm_rmi.c					\
+		host_realm_helper.c					\
 		rmi_spm_tests.c						\
 	)
 
@@ -23,4 +24,4 @@
 TESTS_SOURCES	+=							\
 	$(addprefix lib/heap/,						\
 		page_alloc.c						\
-	)
\ No newline at end of file
+	)
diff --git a/tftf/tests/tests-spm.mk b/tftf/tests/tests-spm.mk
index f2ad0e4..8f44f14 100644
--- a/tftf/tests/tests-spm.mk
+++ b/tftf/tests/tests-spm.mk
@@ -27,4 +27,5 @@
 TESTS_SOURCES	+=							\
 	$(addprefix tftf/tests/runtime_services/host_realm_managment/,	\
 		host_realm_rmi.c					\
-	)
\ No newline at end of file
+		host_realm_helper.c					\
+	)