Remove 'PSA' check from test spec conversion

This is unnecessary because all TZ targets must follow the naming rule: PLATFORM_[NPSA_]S/NS

Author: ccli8

tools/test_api.py

@@ -2274,9 +2274,9 @@ def test_spec_from_test_builds(test_builds):
     for build in test_builds:
         # Convert TZ target name to test spec platform name
         #
-        # 1. All TZ targets should have name pattern: PLATFORM_[PSA_/NPSA_]S/NS, where:
+        # 1. All TZ targets should have name pattern: PLATFORM_[NPSA_]S/NS, where:
         #    (1) 'PLATFORM' for test spec platform name
-        #    (2) 'PSA/NPSA' for PSA/non-PSA targets. Defaults to PSA target on absent.
+        #    (2) 'NPSA' for non-PSA targets. Defaults to PSA target if absent.
         #    (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:
@@ -2285,9 +2285,7 @@ def test_spec_from_test_builds(test_builds):
             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]
-            elif test_builds[build]['platform'].endswith('_NPSA'):
+            if test_builds[build]['platform'].endswith('_NPSA'):
                 test_builds[build]['platform'] = test_builds[build]['platform'][:-5]
     return {
         "builds": test_builds