test(tc): unify platform tests traces

Add some traces at the start and end of platform tests. These traces
are the same regardless of the set of platform tests we run (NV
counter tests / TF-M testsuite / future set of tests).

This makes it easier to integrate these tests in the CI because we can
now have a unified "expect" script for all platform tests, instead of
having one dedicated "expect" script for each possible set of tests.

Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
Change-Id: I5ec30a7a25d8a9a4a90e3338a9789acff7ad4843
diff --git a/plat/arm/board/tc/tc_bl31_setup.c b/plat/arm/board/tc/tc_bl31_setup.c
index 184791e..33e4601 100644
--- a/plat/arm/board/tc/tc_bl31_setup.c
+++ b/plat/arm/board/tc/tc_bl31_setup.c
@@ -52,12 +52,21 @@
 #ifdef PLATFORM_TESTS
 static __dead2 void tc_run_platform_tests(void)
 {
+	int tests_failed;
+
+	printf("\nStarting platform tests...\n");
+
 #ifdef PLATFORM_TEST_NV_COUNTERS
-	nv_counter_test();
+	tests_failed = nv_counter_test();
 #elif PLATFORM_TEST_TFM_TESTSUITE
-	run_platform_tests();
+	tests_failed = run_platform_tests();
 #endif
+
+	printf("Platform tests %s.\n",
+	       (tests_failed != 0) ? "failed" : "succeeded");
+
 	/* Suspend booting, no matter the tests outcome. */
+	printf("Suspend booting...\n");
 	plat_error_handler(-1);
 }
 #endif