Split tests makefile

Instead of unconditionally pulling all test source files in tests.mk,
introduce small makefiles that pull in only those source files that
are required to test a particular feature. For every tests manifest
(test-*.xml files), create the associated makefile.

The main benefit is to compile only the required test source files
when selecting a subset of the tests. For example, if one selects the
SDEI XML file, the TFTF binary only needs the SDEI test cases.

Change-Id: I281eb50846edea2d238c86a795fde8747f8b420b
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
diff --git a/tftf/tests/tests-tsp.mk b/tftf/tests/tests-tsp.mk
new file mode 100644
index 0000000..b1d8b15
--- /dev/null
+++ b/tftf/tests/tests-tsp.mk
@@ -0,0 +1,14 @@
+#
+# Copyright (c) 2018, Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+TESTS_SOURCES	+=								\
+	$(addprefix tftf/tests/runtime_services/trusted_os/tsp/,		\
+		test_irq_preempted_std_smc.c					\
+		test_irq_spurious_gicv2.c					\
+		test_smc_tsp_std_fn_call.c					\
+		test_tsp_fast_smc.c						\
+		test_normal_int_switch.c					\
+	)