Test: Simplify regression test build control

Remove TEST_FRAMEWORK_S/NS.
TEST_FRAMEWORK_NS/S can be replaced by the pair of TEST_NS/S_REG_TEST
and NS. It can remove duplicated test flags

Signed-off-by: David Hu <david.hu@arm.com>
Change-Id: Ida6b6dd951c29e0483a276c411d67874317e08ba
diff --git a/app/test_app.c b/app/test_app.c
index 1efc45f..0e26e89 100644
--- a/app/test_app.c
+++ b/app/test_app.c
@@ -8,7 +8,7 @@
 #include "test_app.h"
 #include "tfm_log.h"
 
-#ifdef TEST_FRAMEWORK_NS
+#ifdef TFM_NS_REG_TEST
 #include "test_framework_integ_test.h"
 #endif
 
@@ -29,7 +29,7 @@
 {
     UNUSED_VARIABLE(argument);
 
-#ifdef TEST_FRAMEWORK_NS
+#ifdef TFM_NS_REG_TEST
     tfm_non_secure_client_run_tests();
 #endif