Convert TZ target name to test spec platform name

1.  All TZ targets should have name pattern: PLATFORM_[PSA_]S/NS, where:
    (1) 'PLATFORM' for test spec platform name
    (2) 'PSA' is optional to distinguish PSA/non-PSA targets, especially when
        both PSA/non-PSA targets are supported
    (3) 'S'/'NS' for secure/non-secure targets
2. Secure target may participate in Greentea, so its name is also truncated here.

Author: ccli8

tools/test_api.py

@@ -2272,9 +2272,20 @@ def build_tests(tests, base_source_paths, build_path, target, toolchain_name,
 
 def test_spec_from_test_builds(test_builds):
     for build in test_builds:
-        if Target.get_target(test_builds[build]['platform']).is_PSA_non_secure_target:
+        # Convert TZ target name to test spec platform name
+        #
+        # 1. All TZ targets should have name pattern: PLATFORM_[PSA_]S/NS, where:
+        #    (1) 'PLATFORM' for test spec platform name
+        #    (2) 'PSA' is optional to distinguish PSA/non-PSA targets, especially when
+        #        both PSA/non-PSA targets are supported
+        #    (3) 'S'/'NS' for secure/non-secure targets
+        # 2. Secure target may participate in Greentea, so its name is also truncated here.
+        if Target.get_target(test_builds[build]['platform']).is_TrustZone_target:
             if test_builds[build]['platform'].endswith('_NS'):
                 test_builds[build]['platform'] = test_builds[build]['platform'][:-3]
+            elif test_builds[build]['platform'].endswith('_S'):
+                test_builds[build]['platform'] = test_builds[build]['platform'][:-2]
+            
             if test_builds[build]['platform'].endswith('_PSA'):
                 test_builds[build]['platform'] = test_builds[build]['platform'][:-4]
     return {